The following is a list of episodes for Ben 10.[note 1] The episodes have a run-time of 11 minutes each, instead of the 22 minute episode format and two 11 minute segments are paired together as one episode in production.
This article is about the episodes in production order (U.K. Airing Order). You might have been looking for the U.S. Airing Order.
Ben and Gwen's camping trip is interrupted by the emotionless Weatherheads - Gust-o, Hail-o, & Shock-o - but a malfunctioning Omnitrix firing out a mishmash of aliens may not be the forecast for success.
Ben, Gwen and Grandpa Max go to a mini-golf course that looks like a miniature town, but are soon interrupted by the Ground Hawg Gang. The gang, thinking that the course is a real town, try to destroy it!
Gax, an eleventh alien, arrives as Ben fights another of Dr. Animo's monsters; when the Omnitrix starts behaving strangely, Ben begins to transform from one alien to another without being able to stop.
With the Omnitrix still uncontrollable, Ben asks a mysterious friend of Max to repair it; when threebountyhunters land to recover the watch, Ben has to try and fight them despite his current predicament.
Ben continues to transform rapidly without stopping and can't revert to human form; 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.
Ben and Gwen volunteer for a day at the Repto Ranch. There they meet the bad guy King Koil, who of course is up to no good. Quickly, both must overcome their fear of snakes and save the animals that the terrible rogue has released.
Ben, Gwen and Grandpa Max stop in the middle of the pampa in the midwest. While Ben makes himself comfortable in his mobile home with his tablet, Max and Gwen go outside to get some fresh air. The calm is abruptly over when the Tennyson family is drawn into the hunt for a Jackalope, a mythical animal that looks like a rabbit with a horn.
Ben is visiting a space museum and is ecstatic when he learns that newly discovered parts of space are being investigated in the museum's laboratory. But when the stuff suddenly comes alive and the slimy something Ben takes shape, the boy has to come up with something quickly. How should he make it clear to others that his identity has been stolen?
During a trip to the Lake of the Ozarks, Ben and Gwen squabble over Ben's unnecessary "half-birthday" celebration, but when Max gets word of a suspicious rockslide nearby, the cousins must put aside their differences if they are to rescue the trapped miners and uncover who is behind the man-made catastrophe before it's too late: the Bugg Brothers.
Left to entertain himself as Max takes a much deserved nap, Ben stumbles upon a Xingo arcade game and goes OE-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 cartoon character.
While Gwen listens to a lecture on the Transcontinental Railroad, Ben sneaks away to the gift shop. But once the Bounty Hunters appear and corner our hero, Gwen must relay the information she learned on the train and use it to their advantage to help Ben escape.
Gwen feels useless when Ben gets a lot of attention for his alien fun in Fort Knox. Maybe an ice could comfort her? Just as she sets out to get one, she sees Charmcaster, who wants to avenge Michael Morningstar. Now the girl can prove to herself that she is a valuable member of Team Tennyson.
After a lull in alien antics a restless 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 hypno-mechanism to hypnotize the entire world, Ben must rethink his strategy.
While Max and Gwen indulge in the magic of winter, Ben could not care less. However, when villains suddenly appear with the goal of destroying the white splendor forever, the hero has to act suddenly to save the city.
Ben and Max just got into a fight when Ben suddenly turned into Heatblast. Shortly thereafter, Dr. Animo discovers Max and turns him into a chicken. Now it's up to Ben to correct his wrongdoing, save Max, and stop Dr. Animo.
On the Internet, Ben finds a video that shows how Cannonbolt disassembles a computer lab. Immediately Ben and the team make their way to the lab to find the intruder. Ben quickly discovers that a fake version of his alien is terrorizing the campus. He has to bring down the guy behind the machine: Steam Smythe!
While bird watching at Pinnacles National Park, Gwen and Ben get into a competition of who can spot more birds first, but once a forest fire interrupts their fun, Team Tennyson must hurry if they are to save the bird population.
As team Tennyson admires the modern train station, Ben sniffs out one of Steam Smythe's robots holding up the line. Once the fed up villain tricks Ben into accepting a duel, the fate of the Omnitrix hangs in the balance.
When Ben grows impatient with the snail like pace of gardening, he goes O-E Overflow to pick up the pace and accidentally floods the community garden. But once a giant sink hole appears and frees King Koil and his Kimodo Dragon from below, Ben must quickly right his wrong and capture the baddies if he is to save the coastal city of Bayburgh.
After a series of reoccuring nightmares affect his sleep, Ben refuses to open up to Max and Gwen about whats bothering him,but once they realize Zombozo himself is behind it, Ben must accept Max and Gwens help if they are going to put a stop to the terror.
As Team Tennyson prepares their boxcar for an upcoming race, Ben's hearing voices and is unable to go Upgrade to enhance his car, but once the race is interrupted by a mysterious Warbot, Ben must overcome the voices inside his head if he is to defeat the giant adversary.
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 missing items from the campsite to create his own massive Junkbot, it is up to Ben to stop his own creation.
After the Junkbot shoots the Omnitrix and it begins glowing neon-blue, an imprisoned 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.
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!
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.
When Grandpa Max's engineer buddy Phil Billings gifts Team Tennyson the Omni-Copter, a state of the art flying vehicle that can transport the Rustbucket for overseas adventures, Steam Smythe takes to the skies to ground Ben and company's first test flight.
During one last stop by a toy store before Ben, Gwen, and Grandpa Max's maiden voyage across the Atlantic, Ben runs into an old bully, Kevin 11, who now has new powers. He's able to transform into aliens just like Ben, such as the "bootleg" doppelgänger of Cannonbolt—Wreckingbolt!
Back stateside, Ben can't get into a cat cosplay competition, Top Tail, without a costume of his own; but when he goes Rath, a new cat-like alien with an attitude, Ben's newfound wild side quickly becomes much more than he bargained for.
A trip to the South Pole goes upside down when Team Tennyson lands on the North Pole instead, but Ben quickly discovers the culprits: Solar & Polar Twain, magnetically-powered scientists who want to hold the world ransom by threatening to reverse Earth's magnetic poles!
Ben, Gwen, and Grandpa Max arrive at a Native American national park to witness the Ayasha Plinths, an ancient Stonehenge-like rock formation. But when the sinister sorcerer Hex arrives, Ben must battle against a beast Hex magically made out of huge rocks!
During medieval times, Team Tennyson must fight to remember that they're not in the past at all, but actually at a Renaissance-esque faire, where "King Zombozo" has hypnotized its guests into thinking they live in the past!
After an overpass collapses on the highway, Team Tennyson is in a traffic jam along with Simon Sez and family. But when Ben and Simon team up to tackle the gridlock together, Simon only makes matters much, much worse.
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 with steampunk powers!
Ben hops into the Rustbuggy for an hour's drive in the dunes of Cape Cod. Kevin arrives and tries to tell Ben something, but, they start to fight. Glitch gets mesmerized by Bootleg's goop and Shock Rock's Omni-Enhanced Energy. Ben and Kevin must team up to save Gwen and Rustbuggy Glitch from his trance.
Team Tennyson travels to the Chrysalen Institute for some well-deserved relaxation, only to find the Bugg Brothers there. Are the sneaky bugs really only vacationing, or are they setting up a silly yet highly dangerous plan once again?
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 must uncover who is really behind it all, Charmcaster!
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.
Team Tennyson discovers a Hartfield-McJoy 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 if he is to save the day!
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 Phil and Grandpa Max tune-up the Omni-Copter, a restless 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!
After winning a Sumo Slammers Champion belt, Ben returns to the Rustbucket to find his prize in the arms of Kevin, but when his rival hijacks the Rustbuggy instead, our hero must stop at nothing to get back what’s rightfully his!
After Ben steps in as a rescuer at a ceremony at the local university, he is invited as a guest of honor at a charity gala. But when Zombozo takes charge of the evening program, Ben not only has to defeat the evil clown, but also his new helper Pirouette!
After Ben has downloaded a new Xingo app on Gwen's tablet, he is drawn into the tablet. Ben lands in Xingo's world and Xingo in the real world. Grandpa Max and Gwen are quickly annoyed by the cartoon character, who has only nonsense in his head. And even Ben does not have it easy in the cartoon world. But how is he coming back?
Ben believes that the Forever Knight is following him. Gwen suggests going to Wheeler, an old gold mining town, to recover a little. But even there, Ben believes that behind all the strange, what happens, is that the Forever Knight.
While taking in the sights and sounds of a Rio de Janeiro music festival, Ben bristles at Gwen's suggestion that she be his new sidekick, but when the festival is threaten by the supersonic sound waves of Lord Decibel, our hero must lean on help from some familiar faces: DJ Gpa and Gwen-Cat!.
Ben is gone. Grandpa asks his old friend Phil for help. Since Ben's watch sends out signals, they can track him down. He is in Switzerland. Together, they set off to find out why Ben ran away and landed on the side of Forever Knight.
Gwen, Grandpa Max and Phil tracked down Ben in an underground lab. They try to dissuade him from joining forces with Forever Knight. With Ben's help, Forever Knight opened a time portal to travel back in time. He wants to prevent the signals sent by aliens to Earth to make contact to be answered. Because then there would be no Omnitrix watches and therefore no aliens.
Team Tennyson stops in at a fringe family reunion, and Ben encounters a whole lot more than kooky cousins— namely, Kevin 11 and the Bugg Brothers, whose latest crackpot invention sparks a series of hilarious head-swaps between all parties.
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 Weatherhreads yet again, this time they are a force to be reckon with, now that Kevin 11 used Bootleg to unlock their emotional controls.
Ben and Gwen look for the infamous Bojamboo (the Bigfoot of the South) and discover that it's actually the Forgeti, at the same time as Kevin 11, but when Ben and Kevin 11 are blasted with the Forgeti's forgetfulness mist, they reverse roles and it's up to Gwen and Max to restore them back to normal.
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 and very 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.
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.
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!
Team Tennyson visits the monuments of Chichen Itza, but when Ben learns about the possible existence of a mythical creature, the Quetzalcoatl, the hero takes it upon himself to find the feathered serpent himself.
Team Tennyson help transport a caged Quetzalcoatl through the Yucatan jungle, only to encounter a saboteur, LaGrange, who hijacks the precious cargo and leads our heroes on a high-octane off-road chase!
↑The episodes of this series have no strictly defined order, with most episodes functioning as stand-alone episodes in their respective seasons, and ordering within a season is generally less relevant, with the episodes being aired in different sequences in different countries. However, this article lists the episodes in the order they first aired in the U.K., which mostly closely matches the production order of the episodes, with the original airdate specifying when the episode was first aired/released online worldwide.