List of Ben 10 (2016 TV series) episodes

Ben Tennyson is tasked with cleaning the Rust Bucket, but when he is tricked into letting Sid and Maurice steal it, he must chase them down before they create an unstoppable maggot monster with the intention of holding Las Vegas for ransom.

Omnitrix alien debuts: Grey Matter, XLR8, Four Arms, and Cannonbolt

Ben, Gwen Tennyson, and Max Tennyson's trip to Niagara Falls is cut short by tadpole-like creatures called Hydromanders, while Gwen attempts to rein in Ben's impulsive tendencies.

• Omnitrix alien debuts: Overflow, and Heatblast

While winning big on a Sumo Slammers video game, Ben gets the idea to win a wrestling match until an intimidating wrestler named Iron Kyle decides to make it a true challenge.

Ben and Gwen's camping trip is interrupted by three emotionless robots called the Weatherheads (Gust-o, Hail-o, and Shock-o) but Ben's attempts to alter the Omnitrix transforms him into unstable fusions of his alien forms.

• Omnitrix alien debuts: Grey Arms, and Amalgam Ben

In a peaceful coastal town Max went to as a child, Ben must not only face the steampunk inventor Steam Smythe, but also his fear of squids.

Ben accidentally allows a villainous group of bugs to go free.

Ben and Gwen are turned into babies by an insane nanny who wants to turn the world into a day care, driven to the brink at having been ridiculed by her peers.

• Omnitrix alien debuts: Upgrade

While visiting a monastery with a no-noise policy, Ben accidentally awakens a dangerous dragon hidden in a secret chamber below the hallowed halls.

• Omnitrix alien debuts: Diamondhead

When a wizard cosplayer gets his hands on a real magic wand at Cos Con, Ben enlists Gwen's help to help stop villainous mage Hex from retrieving it.

Ben is captured by a gang of superior mutants called the Alphas, who lock him inside the secret lab of their mad scientist Doctor Animo, and must help the lesser animals, the Accidentals, escape while stuck as Stinkfly.

• Omnitrix alien debuts: Stinkfly

Ben teams up with Max's former badminton classmates to stop the clown Zombozo from robbing a football stadium.

Gwen, Ben and Max encounter a family who are effectively their mirror selves. However, when their youngest child goes on a temper tantrum and uses a robot suit to bully others, Ben must work to calm the toddler down.

The Tennysons visit Fort Knox, where Ben ends up fighting a monster.

In Silicon Valley, Ben has to stop Steam Smythe from getting an incredible power source sealed in a Tesla time capsule.

Doctor Animo returns with his newest invention, the 'Animerger,' turning humans into hybrids of various animals.

When Gwen and Ben spend time at a water park, Gwen befriends the villainous Frightwig, but the mutant villainess manipulates Gwen with her friendship, shattering her relationship with Ben.

• Omnitrix alien debuts: Wildvine

A man named Tim Buktu attempts to be a hero by creating disasters that put people in danger and then "rescue" them from their doom, and Ben has to stop him before someone really gets hurt.

Ben and Gwen decide to race against the French racer LaGrange when he crashes a race.

The group visit the Buddy's Vision Of Tomorrow exhibit, where Steam Smythe hopes to take a secret weapon to rule the world.

Hex returns for the spellbook Grimoire of Archamada, which will make him more powerful than ever.

While golfing, Ben must face a biker gang of mutated groundhogs, learning the values of patience and control along the way.

When Ben puts out a fire as Wildvine, a trio of rival alien chefs decide to eat him for lunch, hunting him down.

Ben gets a rare Sumo Slammer card in the historical village Oldeville, but Billy Billions wants the card too, so he steals and controls the Rustbucket until Ben gives it back.

When Ben interferes with Hex's quest for the Titan Gloves at a swap meet, he switches the bodies of Ben with Gwen, forcing him to walk a mile in her shoes and vice versa.

Ben and Gwen want to stay awake in Adrenaland, a theme park that is open 24/7. Thinking that with his alien abilities he can stay awake, things get worse when his sleepwalking aliens cause destruction across the theme park.

Ben, Gwen and Max stop by the graveyard set of a movie, The Unalivers (a parody of the Twilight series). Before long, Ben discovers its leading role, Michael Morningstar, is an energy-absorbing vampire.

When Billy Billions takes over Laser Town Studios for his birthday, Ben and Gwen challenge him to a Laser Tag Duel, where the loser must never set foot in a game of laser tag again, but when Billy attempts to cheat by using giant robots, he accidentally turns the robots against humanity, forcing the three to work together.

Ben and Gwen are excited to attend an Earth Day concert in Portland until the show is hijacked by the audio-manipulating DJ Lord Decibel, who, if not paid $1 billion in the next ten minutes, will make Portland fall into the ocean.

Ben hangs out with his former babysitter Penny when they arrive at a pig festival while Maurice and Sydney create a helium weapon for their next big heist.

Zombozo returns with the Circus Freaks (Frightwig, and two new members, Thumbskull and Acid Breath) and a new plan to turn everyone into clowns like him.

During a hunt for the fabled 'Forgeti', Ben and Gwen face Doctor Animo once again when he kidnaps Max for his latest experiment.

When Maurice and Sydney accidentally split Max into 100 clones of himself, Ben must find a way to switch him back without getting divided as well, while Gwen is forced to babysit the childish and dangerously uncontrollable Maxes.

Ben wants to earn some money by mowing Bob's lawn. He rebuilds the lawnmower into a super fast-mowing machine, but in doing so angers the little stubborn gnome neighbors, causing them to attack other humans.

Ben's favorite cartoon character, Xingo, comes out of the TV into the real world when Upgrade tampers with the TV satellite. However, when it turns out that his powers are incredibly dangerous and he has no regard for anyone getting injured, Ben must fight the crazy villain in the Grand Canyon while bound to normal physics.

When the Rust Bucket runs out of gas on a foggy East Coast road, Ben, Gwen and Max are forced to stay at a hotel being menaced by a local folklore expert named Creepy Carl, but nothing is what it seems.

While touring Yellowstone National Park, Ben uncovers a plot by Lagrange who wants to dig up an old treasure from below the national park.

Part One: Ben's trip to Portland with his family is interrupted by the arrival of a brand new, eleventh alien, Gax, as he fights another one of Doctor Animo's monsters. But when the Omnitrix starts behaving strangely, Ben begins to transform from one alien to another without being able to stop.

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Part Two: As the Omnitrix is still uncontrollable, Ben asks a mysterious friend of Max to repair it. But when three bounty hunters — Tetrax Shard, Sixsix, Kraab — land to recover the watch, Ben has to try and fight them despite his current predicament.

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Part Three: The gang heads into the forest to prevent Ben's transformations from causing too much damage. Meanwhile, Vil, who seems to be the same species as Gax, lands nearby. He helps Ben discover his powers, but Ben quickly realizes that this new friend is in fact an opponent. Vil brutally locks Gax, turning Ben to human form, and restoring his true form, the intergalactic warlord Vilgax, who quickly defeats Ben and the three bounty hunters, who are revealed to be fighting against Vilgax. This also results in Ben eventually switching through all his aliens, unable to revert to human form.

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Part Four: After his meeting with Vilgax for first time, Ben continues to transform rapidly without stopping or being able to revert to human. While Vilgax tries to take the energy of a volcano to recharge his ship and return home, Ben gets the idea to "upgrade" the Omnitrix by modifying it with Upgrade itself, giving him enough power to rapidly shift through his transformations and defeat Vilgax to save the earth.

• Omnitrix alien debuts: Gax

On a visit to Cape Canaveral, the Tennyson Trio attend the launch of an experimental space plane, but when Vilgax hijacks the ship, Ben must stop him from weaponizing the shuttle.

• Omnitrix alien debuts: Omni-Enhanced Diamondhead

During the Biggie Box sale, Ben enlists Simon Sez to help him find Max and get back to the register with his toys before the sale ends and Billy Billions buys them instead.

• Omnitrix alien debuts: Omni-Enhanced Wildvine

Aboard the SS Pettigrew, on its maiden voyage, Ben must not only battle seasickness, but Steam Smythe, who looks to use his mechanical creatures to sink the steamship's replacement.

• Omnitrix alien debuts: Omni-Enhanced Heatblast

After their attempt to get a photo with every storefront mascot is foiled, Ben and Gwen sneak out at night to get their photo taken with a wooden bear totem known as Yawk. When it turns out Yawk is an evil spirit, though, Ben must stop Gwen from being eaten by the bear.

• Omnitrix alien debuts: Omni-Enhanced Four Arms

When a cavity forces Ben to the dentist, his day gets even worse when Hex uses a dreamcatcher to bring Ben's fears to life.

• Omnitrix alien debuts: Omni-Enhanced Cannonbolt

Ben and Gwen must save a drive-in theater when Hex brings a movie monster to life, but when it proves too much for them to handle, they must get help from Hex himself to defeat it.

• Omnitrix alien debuts: Omni-Enhanced XLR8

During a routine trip to the DMV, Max takes a driving test to renew his license, but Zombozo hijacks the role of instructor, bent on revenge against Ben.

• Omnitrix alien debuts: Omni-Enhanced Stinkfly

As the Tennyson trio dig up dinosaur fossils in the Badlands National Park, Ben is unaware that Vilgax and Doctor Animo have teamed up to steal alien DNA from within the Omnitrix. When Vilgax betrays Dr. Animo, however, hero and villain must team up against the alien conqueror!

• Omnitrix alien debuts: Omni-Enhanced Overflow, Rath

When Gwen enters a pancake eating contest at the Pancake Palace, Ben finds the Bugg Brothers and must stop them before they obtain an endless supply of pancakes to create their newest inventions, the Infestoids.

• Omnitrix alien debuts: Omni-Enhanced Grey Matter

During a live feed of a transcontinental bullet train, Lagrange enters the picture to outrace the train, but Ben joins in on the fun and will stop at nothing to come out on top.

Ben has a brand new alien: Shock Rock! However, when Vilgax reveals that its presence in the Omnitrix may destroy the Earth, Ben must decide if he should trust Vilgax or not.

• Omnitrix alien debuts: Shock Rock

During a trip, Ben and Gwen squabble, but when Max hears of a rockslide nearby, the cousins must put aside their differences to rescue the trapped miners and stop Sid and Maurice from holding the city above them for ransom.

Left to entertain himself, Ben stumbles upon a Xingo arcade game and uses Shock Rock to power it up, but when it receives too much juice, Xingo leaps out into the real world and our hero must go toe-to-toe with his favorite character, both in the real world and in the game itself.

While Gwen listens to a lecture on the Transcontinental Railroad, Ben sneaks away to the gift shop. But once the Bounty Hunters (from Omni-Tricked) appear and corner our hero, Gwen must relay the information she learned on the train to help Ben escape.

As Max attempts to get Ben and Gwen to the Four Corners Monument before sunset, an ominous fog engulfs the roadway and forces Max to drive at a snails pace, but once the fog comes to life and attacks the Rust Bucket for its battery, Team Tennyson must work together if they are to navigate to safety.

After a lull in alien antics, Ben suggests to Max and Gwen that he might be a better hero if he went solo, but once Vilgax enlists the help of Zombozo to build a giant machine to hypnotize the entire world, Ben must rethink his strategy if he is to defeat the evil alliance between them.

After stumbling upon a cute cat-dog-rabbit hybrid, or “Cadobbit,” Ben ignores Grandpa Max’s advice and sneaks the animal onto the Rustbucket, but is quickly in over his head as it is revealed to be a creation of Doctor Animo, who turns Ben's new pet against him.

When Ben and Max get into an argument, Ben goes Heatblast to blow off steam against Max’s wishes; but once Dr. Animo spots him and subsequently turns Max into a chicken, it's up to Ben to save his Grandpa and stop Doctor Animo.

When Ben grows impatient with the slow pace of gardening, he turns into Overflow to pick up the pace and accidentally floods the community rock garden. But once a giant sink hole appears and frees King Koil and his Kimodo Dragon from below, Ben must quickly make up for his mistake and capture the baddies if he is to save the coastal city of Bayburgh.

Ben and Gwen volunteer for a day at the Repto Ranch. There they meet the evil King Koil, who takes control of the reptiles in the facility to create an army. Both of them must overcome their fear of snakes and save the animals that King Koil has released.

While hanging out at Biggie Box, Gwen grows jealous of Ben's aliens getting all the glamour and attention. But when she discovers that a new villainess, Charmcaster, is really Michael Morningstar's last remaining fangirl turned witch, Gwen must withstand attacks from both her and Morningstar, and prove herself as a valued member of Team Tennyson.

While bird watching at Pinnacles National Park, Gwen and Ben get into a competition of who can spot more birds first, but their contest must be held off until they can defeat Hex, who has found a stone that allows him to create copies of himself.

As Team Tennyson admires the modern train station, Ben sniffs out one of Steam Smythe's robots holding up the line. Fed up with Ben's interference, Smythe tricks Ben into engaging in a duel that will result in the loser's humiliation and forced criticism of the technology they uphold.

After Billy Billions' efforts to carve his face onto Mount Rushmore are thwarted by Ben, the two engage in a battle for the Omnitrix, going back to the time when Ben first gained it, but their meddling through the space-time continuum is causing history to destabilize. With the Omnitrix constantly changing users, can they save time itself?

When the Rust Bucket must tune-up in the same town as Zombozo's latest campaign trail stop, Ben soon discovers the clown is using his speeches to hypnotize and then rob the town.

Ben and Gwen are in a competitive paper airplane war, but when drones created by Vilgax bombard the Rust Bucket, the cousins must work together to ground the aerial attack.

During a trip to Adrenaworld West, Ben takes a detour on a jungle cruise and finds himself hunted by Tim Buktu, who takes control of him using a voodoo doll.

While sightseeing at the Geyser Gulch National Park, the Tennyson trio uncovers Steam Smythe's steam-powered generator and must shut it down before it overloads the power grid and causes numerous environmental issues.

As Team Tennyson leaves the Frozen Man Festival, Lord Decibel takes center stage to ransom the festival-goers, threatening to create an avalanche if his demands aren't met.

Ben, Gwen and Grandpa Max stop in the middle of the Midwest. While Ben makes himself comfortable in the mobile home with his tablet, Max and Gwen go outside to get some fresh air. When Gwen and Max are drawn into the hunt for a Jackalope, a mythical animal that looks like a rabbit with antlers, the mysterious animal soon starts tormenting Ben. But is it real or a trick of Ben's tablet-laden mind?

A mysterious alien substance copies Ben's appearance and powers while Ben is visiting a space museum, and quickly assumes the shape of other people, leaving the Tennysons to find a way to reveal who is actually the mysterious substance.

While Gwen and Max are enamored by wintertime fun during the summer, Ben isn't interested until the Weatherheads attack, intent on feeding off the emotional energy caused by destroying the town.

Ben is shocked to discover that Steam Smythe has built steampunk robots capable of masquerading as Ben's aliens, hoping to discredit the hero's popularity and simultaneously helping his crusade against modern technology.

After a series of nightmares affect his sleep, Ben refuses to open up to Max and Gwen about what's bothering him. Before long, the entire team is trapped in his nightmares as well, putting them up against Zombozo in a nightmare world.

Part One: Message in a Boxcar: Ben and Gwen partake in a box car race, however the race is cut short when a large robot attacks. Worse still, Ben is hearing voices in his head while transformed Shock Rock.

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Part Two: Call the Dream Police: After defeating the Warbot and discovering Vilgax inside, Ben's "secret voices" only worsen and begin affecting his sleep, but once Gwen discovers a sleepwalking Ben using items from the campsite to create his own massive Junkbot, it is up to Ben to stop his own creation.

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Part Three: Strange Bedfellows: After the Junkbot shoots the Omnitrix and it begins glowing blue, Vilgax explains it is now a gateway through which the Fulmini Empire will invade Earth, but the only way to stop them is from within the Omnitrix, so Ben must team up with the ultimate baddie if he is to save his planet.

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Part Four: Mind Over Alien Matter: While inside the Omnitrix, Ben and Vilgax must work together if they are to close the gateway, but once the Fulmini leader - the High Override - appears, even that might not be enough. Luckily, help arrives in the form of a being calling itself Glitch!

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Part Five: High Override: While Ben struggles to avoid the High Override's mind control, Max and Gwen enter the Omnitrix to lend a hand, but once they find Ben is not who he seems, Max and Gwen must pull out all the stops if they are to get Ben back in time to save the planet.

• Omnitrix alien debuts: XLRArmBlastDiamondHeat

When K.O. finds himself trapped in a mysterious place, he encounters other Cartoon Network Heroes and they band together to escape.

• Omnitrix "alien" debuts: Jake the Dog (from Adventure Time), Prohyas Warrior (from Mighty Magiswords), Robot Jones (from Whatever Happened to... Robot Jones?), Festro (from Secret Mountain Fort Awesome), Uncle Grandpa (from Uncle Grandpa), Gumball Wattterson (from The Amazing World of Gumball), Mordecai (from Regular Show), Edd (from Ed, Edd n Eddy), Wirt (from Over the Garden Wall), Moxy (from The Moxy Show), Grizz (from We Bare Bears), Jeff (from Clarence), Grim (from The Grim Adventures of Billy & Mandy), Chowder (from Chowder), Captain K'nuckles (from The Marvelous Misadventures of Flapjack), Monkey (from Dexter's Laboratory), Supercow (from Cow and Chicken), Johnny Bravo (from Johnny Bravo), Buttercup (from The Powerpuff Girls), Dexter (from Dexter's Laboratory), and Finn (from Adventure Time)
• Notes: The events of the crossover specials take place during the fifth and final season of Steven Universe, the second season of OK K.O.! Let's Be Heroes, and the fifth season of Teen Titans GO!.

When Grandpa Max's engineer buddy Phil Billings gifts Team Tennyson the Omni-Copter, a vehicle that can transport the Rustbucket for overseas adventures, Steam Smythe takes to the skies to ground Ben and company's first test flight; but unbeknownst to our heroes, Smythe was sent to battle Ben's latest alien forms by a mysterious, powerful enemy.

• Omnitrix alien debuts: Slapback

Before the Tennyson family embarks on their global road trip, Ben decides to make one last stop at the toy store, but encounters his old bully Kevin Levin, who has developed his own knockoff Omnitrix (the Antitrix) complete with corrupted versions of Ben's aliens. When Ben attempts to get revenge for the years of bullying Kevin put him through, he clashes with Kevin's version of Cannonbolt: Wreckingbolt.

• Omnitrix alien debuts: Humungousaur
• Antitrix alien debuts: Wreckingbolt (doppelganger of Cannonbolt)

Back stateside, Ben can't get into a cat cosplay competition, Top Tail, without a cat costume of his own; but when he goes Rath, Ben's wild side quickly becomes much more than he bargained for, and must learn to hold in his rage.

When Ben, Gwen, and Max try to travel to the South Pole, magnetic disturbances cause the instruments to malfunction and take them to the North Pole instead, where they find that two criminal scientist brothers, Polar and Solar Twain, have plans to swap the magnetic poles of the Earth, unleashing technologic and atmospheric disturbance unless the world pays a ransom.

Ben, Gwen, and Grandpa Max arrive at a Native American park to see the Ayasha Plinths, an ancient Stonehenge-like rock formation. But when Hex arrives, he casts a spell that causes everyone to interpret what he says as a lie, turning Hex into a hero planning on creating the Golem of Ayasha.

During medieval times, Team Tennyson must fight to remember that they're not in the past at all, but actually at a Renaissance-ques fair, where Zombozo has hypnotized its guests into thinking they live in the past.

After an overpass collapses on the highway, Team Tennyson is trapped in a traffic jam along with Simon Sez and his family. But when Ben and Simon team up to tackle the gridlock together, Simon only makes matters worse.

After traveling to Tampa Beach, Florida, Team Tennyson hopes to get some much-needed rest & relaxation, but the Weatherheads have other plans that Ben must thwart: a solar powered tower so that they never worry about losing power.

During a family cookout at a forest campsite, Charmcaster uses her magic to switch places with Gwen, but when Ben catches "Charmcaster" sneaking about, he attacks, unaware it's actually his cursed cousin.

In Aspen, Colorado, Ben, Gwen, and Grandpa Max are on a hike to find the Forgeti, but when they realize they've stumbled upon Billy Billions own "Winter in July" ski resort, Ben must battle Billy, with an assist from the Forgeti itself.

Ben and Gwen's recreational drive in the Rustbuggy takes a turn when Glitch bonds with part of Kevin 11's version of 'Upgrade' named Bootleg. Not only does this cause the Rustbuggy to mutate into a metallic monster, but it makes Glitch become a speed demon who kidnaps Gwen!

• Antitrix alien debuts: Bootleg (doppelganger of Upgrade) and Crystalfist (doppelganger of Diamondhead)

Team Tennyson wonders what the Bugg Brothers are up to when the group runs into them while vacationing at the Chrysalen Institute.

After a battle with Kevin gets cut short, Ben turns his attention to one-upping Gwen at Space Camp. But, when Kevin returns with his sights strangely set on his cousin, our hero discovers who is really behind it all: Charmcaster!

• Antitrix alien debuts: Quad Smack (doppelganger of Four Arms), Hot Shot (doppelganger of Heatblast), and Monster Kevin (doppelganger of Amalgam Ben)

When attacked in the jungle, Team Tennyson is saved by a toddler who looks eerily similar to Tim Buktu, but when they discover it really is a pint sized version of the nefarious globetrotter, Ben knows there's another threat looming: Nanny Nightmare.

Team Tennyson discovers a Hartfield-McJoy (a parody of the Hatfield-McCoy feud) reenactment in the cornfield next door, but when Hex resurrects the ghosts of the real feuding families, Ben must find a way to bring them together to save the day.

While Phil and Grandpa Max tune-up the Omni-Copter, Ben takes the Rustbuggy off-road, but when he is suddenly captured by Tetrax, our hero must not only escape but avoid the wrath of the double-crossed Kraab and Sixsix!

Team Tennyson discovers that a small village's goats are being terrorized by the legendary Chupacabra, but when Ben realizes it's actually Dr. Animo, our hero must thwart the dastardly doctor.

After winning a Sumo Slammers Champion belt, Ben returns to the Rustbucket to find it in the arms of Kevin, but when his rival hijacks the Rustbuggy instead, our hero must stop at nothing to get back what belongs to him. Eventually, though, Kevin and Ben must work together to fend off an attack from the Forever Knight, who is angered at Kevin's refusal to follow orders.

At a local swap meet, Ben instead sets his sights on a Sumo Slammer collectible, but when Kevin takes it for himself, our hero must get it back by overcoming Kevin's secret weapon: an 11th alien named Bashmouth.

• Antitrix alien debuts: Rush (doppelganger of XLR8), Skunkmoth (doppelganger of Stinkfly), and Bashmouth (doppelganger of Rath)

During their visit to the Twin City, Ben and Gwen sign up for some Laser Town awesomeness, but when Ben is teamed up with Kevin, the two must overcome their differences if they are to end up on top, especially since Gwen has been paired with the mysterious Fang. To make things worse, a hit from a laser causes Kevin to be trapped in the form of his version of Four Arms named "Quad Smack", and he needs to find a way to fix his Antitrix to change back.

• Note: This is the 100th episode of the series.

When Team Tennyson's trip takes them to Scotland, they plan on visiting the various locales of Scotland, but their plans are foiled when the Fogg returns to exact its revenge.

Team Tennyson finds out about their British ancestry, so they visit their relative's estate, but mysterious events convince Ben that the place is haunted. However, it turns out that Kevin Levin has followed them to Britain, and showcases three new alien forms based on those Ben has lost: Thornblade (Wildvine), Undertow (Overflow), and Dark Matter (Grey Matter).

• Antitrix alien debuts: Thornblade (doppelganger of Wildvine), Undertow (doppelganger of Overflow), and Dark Matter (doppelganger of Grey Matter)

When Ben and the others take a trip to Paris, Ben, impatient and uninterested, accidentally gets himself locked out of the Omni-Copter. To make things worse, he can't communicate with the people of France, and Ben ends up in the clutches of Zombozo, who hypnotizes him into being unable to speak.

Team Tennyson checks out a Samurai Museum in Tokyo. However, Ben finally comes face-to-face with the Forever Knight when he steals a valuable sword from the museum and starts a chase across the rooftops.

Tim Buktu returns, seemingly reformed after saving people from a dragon in the streets of Tokyo. But the Tennysons suspect there's more to Tim's actions than meets the eye.

In front of a biggie box in Japan, Ben waits in an eternally long line for the release of Cyber Slammers, the brand new Sumo Slammers video game. Soon Ben has to save the whole store - and not in front of the gaming enthusiastic customers, but before Steam Smythe, who wants to equip a big Mech-suit with Steam Punk powers.

While Ben and his family visit the Big Ben Clock tower, the Bugg Brothers once again set up a crazy plan: they want to shrink Big Ben's bell to steal it!

Ben, Gwen and Grandpa Max walk along the Great Wall of China, but almost have their adventure spoiled by racers LaGrange and Vin Ethanol, who want to try a daredevil jump over the wall.

When a mysterious electrical storm downs the Omni-Copter at the Equator, Team Tennyson soon discovers Solar & Polar are behind it, but when Ben accidentally combines the two into a more powerful Uni-Twin, our hero must think fast if he is going to save the planet.

While taking in the sights and sounds of a Rio de Jenaro music festival, Ben bristles at Gwen's suggestion that she be his new sidekick, but when the festival is threatened by Lord Decibel, our hero must lean on help from Gwen and Max to defeat him.

Forever Knight finally assembles his Round Table of young but powerful Knights, including Ben, to conquer all of history.

• This was produced as the season three finale.

Ben is the guest of honor at an upcoming Gala, but when the cirque entertainment turns out to be a disguised Zombozo, Ben must not only defeat the evil clown but his mysterious new sidekick, Pirouette!

During a drag race, Ben hopes to stay neck and neck with Vin Ethanol and La Grange as XLR8, but when his watch keeps shorting out, our hero must get creative if he is to keep up with his fast and furious foes.

After stuffing their faces with gyros, Team Tennyson visit to Greece in the Omni-Copter, but when they are suddenly captured by the Forever Knight mid-flight, Ben ends up in a coliseum, where he is pitted against old foes: Iron Kyle, Queen Bee, and the Ground Hawgs!

After receiving an exclusive ticket to Adrenaland, Ben leaves behind Grandpa Max and Gwen to enjoy the perks of being the parks only attendant, but when he learns he's not alone, our hero must now contend with Billy Billions, the only kid who could afford the park's price of admission.

During a visit to the farm of Penny Bennyson's grandfather, Team Tennyson is haunted by a living scarecrow, but when Ben discovers that Aristocrow is behind it all, our hero must defeat Aristocrow's master, Steam Smythe, if he is to save his cousin's farm.

Ben becomes paranoid when he thinks that all of his surroundings are caused by Forever Knight. Team Tennyson goes to Wheeler, a small town on Route 66 run by one person. There, Ben get paranoid and starts wreaking havoc in the town until he finds the real Forever Knight using bombs to destroy the mine. After saving his family and the people from the mine, Ben gets grounded by Max for his actions. Elsewhere, Forever Knight suspects that Ben should be a part of his team.

• This episode leads into Roundabout

When a new Xingo app mysteriously appears on Gwen's tablet, Ben activates it despite his cousin's disapproval, springing a trap that transports Ben in the animated world and Xingo into the real world.

Ben and Gwen can't wait for the Omni-Copter to arrive at the Great Pyramids, but when bad weather disrupts their flight, they soon come face-to-face with the Fogg and its offspring.

Kevin gives Xingo a power up – setting him loose to wreak havoc on other TV shows – and it is up to Ben to stop them both.

Team Tennyson stops in at a fringe family reunion, and Ben encounters a whole lot more than kooky cousins— namely, Kevin and the Bugg Brothers, whose latest invention sparks a series of head-swaps between all parties.

When Zombozo hypnotizes Grandpa Max's baking class, it is up to Ben and Gwen to clean up the mess, but it gets even messier when Zombozo reveals that Kevin has become his new bodyguard.

Team Tennyson's thrift store shopping is ruined by the latest high-speed heist of LaGrange — who is now aided by a super-fast electromagnetic racing car — and Ben must convince Kevin 11 to help stop the speed demon's globetrotting robbing spree.

After Ben easily dispatches the Weatherheads, Team Tennyson travels to a ski resort for some fun in the snow, but when Ben runs into the Weatherheads yet again, this time they are a force to reckon with now that Kevin has used his powers to unlock their emotional controls.

When Ben finds out that Kevin and Vin Ethanol have teamed up, he becomes jealous, and especially worried that Kevin will try to have his friend embrace his bad side.

While Ben wants to stop Queen Bee from robbing a bank, Kevin also decides to show up, wanting to bask in the glory Ben gets as a hero.

When Charmcaster and Kevin end up in a poetry convention, Kevin's emo poems combined with Charmcaster's amulet (which she received from her uncle) gives her immense magical power and now seeks payback on Gwen.

After an encounter with the Forgeti, Ben and Kevin end up with the others' phones, causing Ben to turn into a selfish punk and Kevin into a hero. However, have they truly changed alignments or are their real personalities ready to resurface?

Team Tennyson visits Adrenaland Jr., a more safe version of Adrenaland. But when Kevin appears, Ben has to stop him before he destroys the park.

When Kevin convinces Steam Smythe to adopt a modern approach in fighting Ben, our young hero must resort to old-fashioned thinking to save the day.

When Ben and Gwen try to create a cooking video, Kevin starts trying to gain his own following with crackpot conspiracy theories and encouraging the consumption of junk food. The social media war resulting from the two shapeshifters soon starts to escalate into real world conflict.

Part One: Pyramid Scheme: While the Tennysons visit Chichen Itza, Dr. Animo fuses a chicken and a snake to create a real life quetzalcoatl.

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Part Two: The Wages of Fear: Ben tries to stop La Grange from kidnapping the quetzalcoatl while gripped in self doubt.

Omnitrix alien debuts: Omni-Kix Shock Rock, Jetray (unofficial debut), Omni-Kix Cannonbolt

Part One: A Slice of Life: The Tennysons go to Rome to visit a famous pizzeria, only to find that the Bugg Brothers have taken over it as part of their latest scheme.

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Part Two: The Bee's Knees: The Tennysons help Maurice when Queen Bee kidnaps his brother Sidney.

• Omnitrix alien debuts: Omni-Kix Slapback

Grandpa Max's alma mater asks him to use the Omni-Copter to transport an important exhibit to an exotic nature reserve, but when the exhibit turns out to be a rare large baby moth, Ben must keep Tim Buktu from stealing the moth while learning that sometimes you need to use finesse and not force to solve hard problems.

• Omnitrix alien debuts: Omni-Kix Four Arms and Jetray

The Tennysons find themselves stuck inside an inescapable funhouse constructed by Zombozo; Ben goes alien and fights to escape, ultimately proving that behind every illusion, there's a disappointing secret.

• Omnitrix alien debuts: Omni-Kix Heatblast

The Tennysons journey back to the crater in North Dakota where Ben first found the watch. They discover a key that greatly boosts the Omnitrix and gifts Ben with robotic armored advancements for his aliens, starting with Omni-Kix Four Arms!

• This is meant to be the season four premiere.

Ben and Gwen learn a rumor of an alien invasion happening at the park they are camping at, but when they investigate, they discover a preserve containing a host of mutated creatures engineered by Animo.

• Omnitrix alien debuts: Omni-Kix Humungousaur

Ben, Gwen and Grandpa Max arrive in Bismarck, North Dakota for its annual celebration of bee pollination, bringing them face-to-face with Queen Bee and forcing Ben to conquer his new fear of bees.

• Omnitrix alien debuts: Omni-Kix XLR8

Team Tennyson must save Shoshone Falls from Steam Smythe.

• Omnitrix alien debuts: Omni-Kix Rath

While visiting Lake Erie, a relaxing day at the beach gets all washed up when Ben, Gwen and Grandpa Max come face-to-face with Hex and Kevin.

Team Tennyson faces tough competition at an obstacle race. While Grandpa Max struggles to keep pace with an unbelievably fit rival, Ben and Gwen run into the Weatherheads, who have secretly masterminded the race to test mankind!  

• Omnitrix alien debuts: Omni-Kix Diamondhead

After the Rustbucket breaks down, Ben, Gwen and Grandpa Max find themselves killing time at the local town library, but soon scramble to out maneuver Hex as he searches for a hidden ancient artifact of great mystical power.

Team Tennyson enjoy the biggest convention in town, but when a gawky costume store employee finds a familiar-looking helmet in the back of the store and tries it on, Ben is faced with the return of an old foe in a new form: Forever Knight!

While visiting Carlsbad Caverns National Park, the Tennyson's come across the "Bottomless Pit", a naturally formed pit with no bottom. Ben fights his better judgment to jump in the pit and be the first person to find the bottom, until Kevin 11 shows up and starts to goad Ben into a contest to the bottom of the pit! The natural rivalry is put on hold, however, with the arrival of Breaker One-Nine, who has come to destroy the Caverns!

Team Tennyson trade campfire stories in an anthology-style series that pits Ben against his archrival, Kevin, and teaches him the power of imagination.

Ben completely ignores Gwen when she takes him to a family fun center. Meanwhile Frightwig pushes Zombozo back into a life of crime after he ends up becoming a party clown. Now both Ben and Zombozo will have to learn that you shouldn't ignore your friends!

At the Mojave Wind Farm in Texas, Max and Gwen plan to set Ben straight on his kooky ideas about how wind works. But when they find the Weatherheads using the towering turbines for their latest nefarious plan, will Ben face facts in time to blow them away?

Ben and Gwen don't want to go to the CD Library, but Lord Decibel ends up trapping them inside it and demands a ransom. Ben and Gwen find Kevin inside on a potentially nefarious quest of his own, but it turns out that Lord Decibel may have already found the item that they so desperately desire.

Team Tennyson heads to the Okefenokee Swamp to witness the blooming of the Blushing Orchid, something that happens once every one hundred years. But their plans get disrupted when Tim Buktu, trying to make his new "reality" show more exciting, endangers the rare flower and everyone else at the swamp.

Part One: Big Bugg Bash: While in Tokyo, Team Tennyson comes face to face with a horrible secret, Japan's hottest new restaurant is being run by the Bugg Brothers as a nefarious scheme to make loads of money off an unsuspecting public.

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Part Two: Slamming It Up: While on a visit to the Sumo Slammers Amusement Park in Tokyo, Team Tennyson gets to watch a genuine sumo wrestling match as part of the Global Games, but when the mischievous Twain Twins crash the event to avenge their mother's medal snub years earlier, Ben must think things through if he is to stop the polarizing family!

Ben and Gwen are stoked to enter a skating competition, but when Nanny Nightmare shows up to teach the skater kids some manners by turning them into babies, it's up to Team Tennyson to up their game if they are to have any chance at saving the day.

When Hex mistakes an exclusive magic club for a top-secret wizard society that had snubbed him, Ben has to figure out how to work around the club's strict code of conduct to stop him without getting booted by security.

On a trip to the dentist's office, Ben's suspicions that something is odd with his dentist are proven when he transforms into the monstrous Toothache. Ben must save the day!

When Steam Smythe 'time travels' his way into a Renaissance Faire and kidnaps Max, Ben and Gwen must defeat him without breaking character.

Team Tennyson participate in the inaugural ride of the fastest train in the world but the conductor turns out to be Lord Decibel and Ben must derail his master plan.

Ben, Gwen and Max are on the road again and are supposed to be taking in the sights but Ben refuses to put his video games away. Only the return of Xingo can spur him into action!

Team Tennyson go on a tour of the new Biggie Box Candy Store but when Toothache breaks out and kidnaps the owner, it is up to Ben to stop the monstrous dentist.

When Team Tennyson visit Raspberry Park, they get more than they bargained for. What they think are innocent games of chance are a revenge plot by Zombozo to steal the Rustbuggy.

Team Tennyson travel to the new Laser Town VR but when Kevin cheats his way to the top, Ben must team up with former champ Fang if he is going to defeat his souped-up rival.

Ben, Kevin, and LaGrange find themselves stuck "outside of time" after the latter hijack a supersonic train with a fault engine, forcing the trio to team up and slow down.

As Team Tennyson stops Dr. Animo from raiding the animal shelter, Ben faces one villain more than he bargained for -- King Koil, now Animo's pet.

After Tim Buktu's live stream is mysteriously cut short, Team Tennyson must break inside the highly confidential Area 55 to save him.

A blast from Ben's past returns to do double the damage on Team Tennyson and planet Earth itself, forcing Ben to go interstellar to save the day where he encounters the Omnitrix's creator, Azmuth.

• Omnitrix alien debuts: Omni-Kix Jetray, Omni-Naut Jetray, Omni-Naut Humungousaur, Omni-Naut Heatblast, Goop, Omni-Naut Shock Rock, Way Big

• Antitrix alien debuts: (by Vilgax) AntiVilgax and Alien V

In the distant future, an alien race called the Xerge comes to Earth to invade the entire world forcing President Gwen Tennyson to recruit her long-lost cousin, a disillusioned Ben 10,000. Ben 10,000 must recruit his past 10-year-old self to stop the Xerge invasion with a Xerge transformation of their own.

• Omnitrix alien debuts: Surge

• Omnitrix (Future) alien debuts: (by Ben 10,000) Spidermonkey and Buzzshock

• Antitrix alien debuts: (by Future Kevin) Humungouraptor

After a battle with Hex in Washington, D.C., Ben isn't ready for his summer to end. However, he catches the attention of Rex Salazar and Bobo Haha, two Human and Chimpanzee/EVO hybrids running from Agent Six and the Providence wanting to capture Rex as an asset. When Rex leaks Ben's alien DNA into the entire world infecting people into Omnitrix aliens, Ben, Rex, and Bobo must stop Hex from turning infected Omnitrix/EVO people into an army of aliens.

• Guest Starring: Vic Chao as Agent Six
• Notes: The events of the crossover specials take place after the final episode of the series.

After failing to save a Ben who's lost his Omnitrix to the mysterious Alien X, an alternate dimension Max named Maximilian travels to the reboot dimension to warn Team Tennyson that Ben is the target of Alien X who travels around the Omniverse to steal Omnitrixes from alternate Bens and injure or kill them. After Alien X finally gets his hands on Ben's Omnitrix, a Omnitrixless Ben, Gwen, Max, and Maximilian must ally themselves with Classic Ben ages 10 (Classic), 15 (Alien Force), 16 (Ultimate Alien) and 16 (Omniverse) and Gwen 10 to get Ben's Omnitrix back and defeat Alien X once and for all.

• This special is a crossover with the Ben 10 Classic Continuity^[2]
• Omnitrix (Classic) alien debuts: (by Classic Ben) Heatblast

• Omnitrix (Alien Force) alien debuts: (by Alien Force Ben) Chromastone and Big Chill

• Ultimatrix (Ultimate Alien) alien debuts: (by Ultimate Alien Ben) Ampfibian

• Omnitrix (Omniverse) alien debuts: (by Omniverse Ben) Bloxx

• Omnitrix (Gwen 10) alien debuts: (by Gwen 10) Ripjaws

• Omnitrix (Evil Ben) alien debuts: (by Evil Ben) Alien X

Ben tries to do a skateboard stunt using Upgrade, but crashes to the ground.

Wildvine tries to dance with amusement park mascots and Gwen, but tangles them up in his vines.

Diamondhead tries dancing, and breaks a window.

Ben tries to do the perfect cannonball using Cannonbolt!

Ben uses Heatblast to cook popcorn and burns a hole in the tent.

XLR8 tries to make a new speed record, but turns back into Ben at the wrong moment.

Ben uses Four Arms to win a jumping contest.

Overflow shows off at a national park, only to get hit by an orca.

Ben turns into Grey Matter to stop Grandpa Max´s snoring.

Ben makes a bet with Gwen that he cannot be hit by water balloons as Wildvine.

Stinkfly messes up using his powers.

Overflow blasts Grandpa Max off a slide and in the ocean.

Upgrade upgrades the AC, and covers the RV in snow in the process.

XLR8 makes a bet with Gwen that he can reach a clock tower in 10 seconds.

Cannonbolt gets stuck in the sand trying to do a stunt at the beach.

Ben does some epic burps using Heatblast!

Four Arms shows off with armpit farts.

Grey Matter shows he can fight at any size.

Stinkfly plays a prank on Gwen and Max.

Diamondhead and Gwen use the art of light refraction start a campfire... and burn off Grandpa Max's hair in the process.