Benjamin Kirby "Ben" Tennyson was a normal ten-year-old kid until he found the Omnitrix, a powerful watch-like device that allowed him to turn into ten different aliens. Though initially immature and clumsy, Ben grew to be a true hero. By the time he was sixteen, he had become famous in not only his hometown of Bellwood, but on Earth and beyond. Ben has also been deputized by the Plumbers and gained more aliens as time progressed.
Originally, Ben was just a ten-year-old boy who grew up in Bellwood. He was unpopular to his classmates and was often bullied by two boys named Cash and J.T.. However, his life changed the day that he went on a summer vacation with his grandfather Max and his cousin, Gwen
That evening, they stopped to camp in the woods. Ben witnessed the crash of a strange capsule from space, which happened to contain the Omnitrix, a powerful watch-like device.
As soon as Ben found the device, it firmly affixed itself onto Ben's left wrist, and Ben was unable to remove it. At first scared, Ben soon discovered that using the Omnitrix, he was now able to transform into ten super-powered alien creatures, and began to use the device to become a superhero. Though he occasionally arrested ordinary criminals, he was quickly led to also fight super-villains, starting with Dr. Animo, Kevin 11, and ultimately, Vilgax, a vicious and evil alien warlord who would stop at nothing to get the Omnitrix for himself.
Despite being very immature and occasionally using the Omnitrix for minor selfish purposes, Ben proved to be a valuable wearer for the Omnitrix, defeating Vilgax and saving people several times.
In Ben 10: Secret of the Omnitrix, during a battle with Dr. Animo, Ben accidentally activated the Omnitrix's self-destruct and rushed off with Gwen and Tetrax Shard to find the Omnitrix's creator. He was joined by Myaxx and later learned that the countdown sped up when he transformed. He learned he could be a hero without the Omnitrix. Ben then discovered the creator of the Omnitrix, who was really a Galvan named Azmuth. Azmuth shut down the self-destruct and gave Ben access to a new alien, a massive form named Way Big. With Way Big, Ben easily defeated Vilgax and hurled him into space.
In Ben 10: Destroy All Aliens, it was the end of the summer vacation (as well as after the events of the previous movie) and Ben, Gwen and Max spent their evenings fighting aliens and criminals on the streets of Bellwood. During a battle against a robotic tank, Ben as Upgrade and Gwen argued about the best way to defeat it, leading to Gwen using a magenta/pink-colored dismantling spell on the tank while Ben was attached to it. Unknown to the children, this led to a malfunction in the Omnitrix. Later, after a mishap in the school, the Omnitrix accidentally teleported his homework. Ben was later grounded by his parents and forced to stay home and do a history report. Ben attempted to work on the report before the Omnitrix teleported his laptop away as well. Shortly afterward, Tetrax arrived and told Ben that Azmuth asked to meet with him. They went to meet Azmuth but were attacked by an evil version of Way Big. Tetrax and Ben fought the alien, who was also teleported into the Omnitrix, though neither of them were aware of it. Tetrax decided to take Ben to search for Azmuth and activated a new function on the Omnitrix. Before he could explain this new ability, the ship was attacked and Ben was sucked out into the atmosphere, falling to the ground as Diamondhead. It was later revealed that the new ability prevented Ben from reverting back into normal when he timed out, simply transforming between alien forms.
Ben as Four Arms arrived at Stonehenge and was attacked by a weaponizing Galvanic Mechamorph who demanded to know about the alien that attacked Four Arms. Four Arms tried to explain he knew nothing, but the Mechamorph only continued to attack. The Mechamorph's teleporting ability caused the pair to carry their battle across the globe, destroying part of Stonehenge and nearly damaging Cristo Redentor in Rio de Janeiro and fighting at the Great Pyramids in Egypt before arriving back in Bellwood. Ben transformed into Grey Matter and managed to escape the Mechamorph. Meanwhile, Gwen and Max received a call from Ben's parents Carl and Sandra informing them that Ben had escaped the house. They went in search of him, only to find Tetrax and discover Azmuth's ship. Looking at the ship's log, they discovered that Azmuth disguised it as a semi-truck to track down and fix the malfunctioning Omnitrix, but crashed and was destroyed by the evil Way Big. After escaping the Mechamorph, they soon encountered Ben back at his house and Tetrax restored Ben's Omnitrix to revert Diamondhead back into normal just as the Mechamorph caught up to them. Gwen saw how the Omnitrix reacted after Ben reverted to human form and deduced what had happened just as she, Ben, Tetrax and the Mechamorph were transported into the Omnitrix itself.
Inside, Ben and the Mechamorph continued to battle before being attacked by a swarm of Stinkflies just as Gwen and Tetrax were ambushed by a herd of Wildmutts. The four caught up with each other and they realized that the evil Way Big was inside with them just as he resurfaced. The Mechamorph, who was revealed to be Azmuth's father, attacked the Way Big in revenge for killing his son while Gwen explained to Ben about the malfunction that she caused to the Omnitrix when she cast the dismantling spell on the robotic tank while Ben was attached to it. She used Azmuth's father to reverse transportation and return them to Earth. Unfortunately, the Omnitrix malfunctioned again and transformed Ben's parents into Wildmutt and Heatblast, causing Gwen to realize that the evil Way Big was Azmuth himself. Leaving Max and Tetrax to handle his parents, Ben and Gwen followed Azmuth's father and Azmuth to the city park where Ben transformed into Way Big to subdue Azmuth and hold off his father while he and Gwen tried to reverse the transformation. They soon convinced Azmuth's father that his son was the very alien that they were fighting and the three worked together to convince Azmuth to regain control of himself, use his father's Mechamorph abilities to fix the Omnitrix and transform Azmuth back into normal. Azmuth reprimanded Ben and Gwen for their errors and revealed his father is a Galvan wielding a Mechamorph-type armor. Returning to Ben's house, Azmuth transformed Ben's parents back into normal and repairs the Rust Bucket, previously destroyed in the battle, before leaving to reconcile with his own father. Ben's parents, having forgotten that they grounded Ben, told him to enjoy his fishing trip with Max and Gwen. Ben declined, having learned to be more responsible, and stayed home to finish his history report for school. The movie ended with Ben, Gwen, and Max on another road trip where they encountered Dr. Animo again and the three prepared for another exciting battle.
10-year-old Ben reappeared in the Ultimate Alien episode, The Forge of Creation, having come sometime after summer vacation. He was even less well behaved compared to his character from the Original Series. When he was examining 16-year-old Ben's Ultimatrix, he called NRG and Brainstorm "lame", Goop "weak", and Humungousaur "okay", due to his big size and stature.
Ben had continued to use the Omnitrix to encounter and defeat different types menaces both terrestrial and extraterrestrial in origin in addition to going on adventures with Gwen and Max a year later when he was 11 years old.
The sequel Ben 10: Alien Force continues Ben's adventures five years after the original series. At some point between the two shows, Ben, now fifteen years old, had succeeded in removing the Omnitrix through an unknown but difficult process and chose to retire from his superhero career in order to have a normal teenage life, though he kept the deactivated Omnitrix as a souvenir. He then grew up into a slightly more mature teenager, losing his unpopular status at school and becoming a skilled soccer player.
However, after winning his latest match, Ben finds that his Grandpa Max had mysteriously disappeared while investigating what Magister Labrid calls "an alien conspiracy with Earth in the middle" leaving only an enigmatic holographic message for Ben. Despite Gwen's doubts, Ben decided to use the Omnitrix again in order to find Max. When he reattached the Omnitrix, it recalibrated itself, taking on a new, more watch-like appearance and providing him with a new, more exotic set of alien transformations. These ten new aliens were more powerful than his original ten.
While helping the Alien Plumber Magister Labrid investigate Max's disappearance, Ben and Gwen encounter Kevin, now a weapons dealer, brokering a deal between the DNAliens and the Forever Knights. Kevin attempted to attack Ben, still bitter after all his past defeats against him and his eventual imprisonment in the Null Void but was again easily defeated after fighting Ben's new alien Swampfire and caught by Labrid. He then agreed to help them, hoping to get back the money he lost during the deal. Eventually, after an altercation with the Forever Knights and Labrid sacrificing his life to save Kevin's, Ben, Gwen, and Kevin start working together as a team to face the Highbreed's expected invasion on Earth.
At the same time, Ben developed mutual feelings for Julie Yamamoto, an Asian/American girl from his school. Though he was initially afraid of developing a relationship with her, fearing she'll reject him if she found out about the Omnitrix, he was eventually pushed by Gwen into taking her to a date at the Pier. The date, however, went wrong when a Galvanic Mechamorph symbiote, later named Ship started attacking Ben in an attempt to get his attention. This incident eventually forced Ben to reveal his powers to Julie, but to his surprise, she didn't reject him, even calling the Omnitrix "cool." The two eventually continued dating, while Ship became Julie's pet.
Ben also discovers that himself, his cousin Gwen, his father Carl, and Uncle Frank have alien heritage from an alien species called Anodites, though it is a dormant gene within him and he does not have the same potential that Gwen does. This is proven in the episode, Ben 10,000 Returns when he magically produced an energy shield to block Eon's aging ray.
At some point, Ben received a visit from a mysterious clone-like being of himself. The clone introduced himself as Albedo, a Galvan, stating he was the true creator of the Omnitrix and that Azmuth was a liar. He asked Ben to hand over the Omnitrix, stating he was trapped in Ben's body since his DNA had become the Omnitrix Default and needed Ben's Omnitrix to override the device's programming. When Ben refused, he turned violent and attempted to take it by force. After two clashes between them, Azmuth appeared and revealed that Albedo was actually his assistant, who was untrusting of Ben and had attempted to make his own Omnitrix. As a punishment for his arrogant act of rebellion, Azmuth removed Albedo's Omnitrix's central component, leaving him trapped in a damaged, photo-negative version of Ben's human form, and sent him to a Null Void prison.
During one mission, Ben was accidentally sent through a teleportation device with the Highbreed commander Reinrassig III, causing both of them to be trapped on the hostile planet Turrawuste and forcing them to work together in order to find a way back to their respective home worlds. Though initially displaying the usual racist Highbreed's behaviors, Reinrassig slowly developed a friendship with Ben and eventually lost his hand trying to save him from a local vicious life form. After Ben heals his hand as Swampfire, they eventually reach the teleportation gate, but Reinrassig III chose to self-exile himself on Turrawuste, as he believed his friendship with Ben had corrupted him in the eyes of his people.
Ben eventually assembled a team, consisting of himself, Gwen, Kevin, Alan Albright, Professor Paradox, Julie, Ship, Cooper, Azmuth, and a briefly reformed Darkstar for a final attack on the Highbreed's hideout in Los Soledad in order to prevent the Hyperspace Jump Gate located there from being activated, which would unleash the Highbreed fleet on Earth. Despite help from Max and the Plumbers' helpers, they failed to prevent the arrival of the fleet. Ben then went with Gwen, Azmuth, and Kevin aboard Ship through the Jump Gate to the Highbreed homeworld. He then discovered the Highbreed were actually trying to exterminate every known sentient being in the Milky Way galaxy because they were slowly dying out and, as stated by Azmuth, their belief in purity among their kind had led to inbreeding, a loss of disease resistance, and finally sterility. Ben, as Humungousaur, asked if the Omnitrix can repair the genetic damage to all of the Highbreed; the device replied that it can, but such an action would require all of its available power. After turning Ben back to his normal self, it then charged up and released a powerful energy/DNA wave that infused all the Highbreeds with alien DNA from the Omnitrix's genetic database, thereby repairing their genetic damage in the process and saving them from total extinction. Though they were initially disgusted by this, Reinrassig III then re-appeared from his exile and showed them how this "genetic impurity" was giving them a second chance at life. Realizing he was right, his comrades named him Highbreed Supreme and he ended the war, thereby bringing peace to the galaxy once more.
After his successful attempt at ending the Highbreed Conspiracy/Conflict on Earth, Ben grew famous and was celebrated as a hero throughout the whole galaxy, and received awards from various Alien Ambassadors. This caused him to eventually relax and return to his immature and somewhat cocky attitude from the original series, much to Gwen's and Kevin's chagrin. When he had to face the return of his old nemesis Vilgax, Ben attempted, with help from Kevin, to hack the Omnitrix in order to unlock the master control. This attempt went awry, releasing Goop, Chromastone, Spidermonkey, and Way Big from the Omnitrix as mindless, instinct-controlled creatures and causing Kevin to mutate for the second time. Worst of all, Ben loses Azmuth's trust. After reabsorbing the four aliens, Ben faced Vilgax and eventually defeated him as Diamondhead, though he temporarily lost Chromastone in the process.
Ben continued working as an honorary member of the Plumbers with Gwen and Kevin, with Max providing them with various missions throughout the third season of the series). He also had to deal with Vilgax, who continued trying to find ways to have his revenge on him.
Eventually, Ben had to face a coalition of Vilgax and Albedo, the latter having stolen a prototype upgraded version of the Omnitrix, the Ultimatrix, from Azmuth's lab. The two of them successfully took Kevin and Gwen hostage, leading Ben to deliver the Omnitrix to Vilgax. However, Ben eventually was forced into activating the Omnitrix's self-destruct sequence, threatening Vilgax to let it explode if he didn't remove it. Vilgax mistook this for a bluff, and paid the price, causing Kevin to lose his old mutation in the process. However, Ben then forced the Ultimatrix off Albedo to fight Vilgax as Swampfire and then as Ultimate Swampfire. The galactic conqueror's ship then hit the Pacific Ocean just offshore from Bellwood, with Ben, Gwen, Kevin, and Max all escaping from it mere moments before its Fusion Drive exploded like a bomb.
In Ben 10: Ultimate Alien, sixteen-year-old Ben's secret identity is revealed to the world and he's now a megastar superhero loved all over by kids. This series features Ben's new car, the DX Mark 10 a heavily modified Mazda RX-8, which marked its first appearance in Ben 10: Alien Swarm, the car being gifted reluctantly by Kevin.
He is also seen with Julie, who now shares a considerably stronger bond with; the two help their team from time to time. He and Julie also share their first on-screen kiss at end of the episode Fame, though it was merely a kiss on the cheek. He gained a lot of confidence after Julie kissed him, and Ben appeared to be utterly shocked at Julie kissing him on the cheek. Ben and Kevin are now true friends, not rivals.
Ben is now armed with an enhanced, upgraded version of the Omnitrix, the Ultimatrix, which evolves his aliens into their Ultimate Forms, and also has every alien he has ever transformed into, though at the moment, Ben has yet to either transform into or re-unlock all of them. He is now also on good terms with his old school bullies, Cash and J.T.
The series introduces two new enemies for Ben's rogue gallery: nasty news reporter Will Harangue, who sees Ben as a public threat, and a villainous Osmosian named Aggregor, whose sinister plan involves draining the powers of five powerful aliens from the Andromeda Galaxy to make himself the most powerful being in the galaxy. Interestingly, these five aliens also provide Ben with his five newest alien forms.
After Ben scanned Ra'ad, he now has a total of 1,000,910 genetic samples in the Codon Stream. After Kevin was mutated by absorbing the Ultimatrix's Energy Core and lost his sanity again, he successfully defeated Aggregor with help from Young Ben. Kevin was finally cured in Absolute Power: Part 2 with help from Darkstar and what was left of the Dominus Librium. After rescuing Baz-l in Eye of the Beholder, he and Julie become a couple again as he promises to be a better boyfriend.
He then faced the Lucubra, a demon creature from an alternate dimension. He was told to beware it by a man named Old George and by Paradox in Ben 10,000 Returns.
He appears in the Generator Rex episode Heroes United in order to help Rex deal with a "common threat" which was the sentient Alpha nanite. His appearance changed based on the series art style, becoming sleeker and more mature.
Ben was at a celebrity gig when a strange storm picked him up and dumped him into Rex's world, where he mistook Rex Salazar for an alien attempting to destroy Bellwood. However, he was also mistaken for an EVO, who Rex tried to cure, but both found that they were not what the other thought they were.
"Captured", Ben was taken back to Rex's with an unconscious Agent Six following a battle with an unknown enemy he had been chasing through the storm. While in the base, Ben learned of what was going on in that world, becoming confused by some facts, but generally grasping things are not going good.
Deciding to team up with Rex, Ben met Caesar, Rex' brother and learned that he had banished the Alpha nanite to the Null Void, thinking it was an empty dimension when in reality it's a prison for alien criminals.
However, Alpha had returned and planned, not to mention succeeded, to absorb Rex's Omega 1 Nanite to finally create a body that could sustain itself, in addition to that it copied the Ultimatrix for extra firepower. Ben transformed into Upgrade and fused with Rex, allowing them to use more powerful versions of Rex's weapons to beat down Alpha. With Caesar's help, Ben entered the Null Void as a stop on the way back home, using Murk Upchuck to dump Alpha into the Null Void.
In Solitary Alignment, he learns about Azmuth's creation, the Ascalon, the sword that is wielded by Sir George and is told of how Sir George obtained the sword. Ben struck up a deal with Sir George, that if he is unable to slay Dagon, then he will take the sword and attempt to defeat Dagon.
In The Ultimate Enemy: Part 1 and Part 2, Ben and his team go to the final battle between Dagon and Vilgax. Dagon turns every human on Earth into an Esoterica and fought Ben and George. Dagon's seal was broken, and he appeared in the human world. Dagon was too strong for even Ultimate Way Big to stand against, and Sir George was turned to dust when trying to fight him. Vilgax used Psyphon's device to drain Dagon's very essence to transfer his power to him. The team took the sword Ascalon and fled to the Mount Rushmore Plumber base. Vilgax forced his way inside and knocked Gwen and Kevin unconscious. Vilgax boasted about how he planned to fight another of Ben's Ultimatrix transformations; Ben decided to use a different means to fight him, Ascalon. He uses the sword to subdue Vilgax and absorb Dagon's power from him.
Ben may have won the battle, but he is tempted by Vilgax. Since he has the power of the Ultimatrix, Ascalon, and Dagon at his fingertips, he could fulfill his desire for peace and justice with a simple thought to destroy all evil. Ben considers this at first, but Gwen, Kevin, and even Julie try to talk him out of it. It seemed that he wouldn't give up until he uses the power to turn every Esoterica on Earth back to normal, and all the free will that goes with it. He relinquishes the sword, saying that Azmuth was right, it is too much power for anyone to have. Azmuth appears and Ben gives the sword back to him. He asks for the Ultimatrix too and gives Ben a new Omnitrix, one that he has been working on for six years since he found it. Ben asks for its Master Control, to which Azmuth replies perhaps for his 18th birthday.
16-year-old Ben also appears in a flashback in Rules of Engagement where he is in his room playing Sumo Slammers. He starts talking to Julie but he also starts yelling out to the game at the same time. Julie, believing Ben broke up with her, turns off her phone and the flashback ends.
A few months after the events of Ultimate Alien, Ben is left to be a solo hero after Gwen Tennyson and Kevin Levin leave for college in The More Things Change: Part 1. However, Grandpa Max has other plans. He teams Ben up with a Plumber rookie just out of training named Rook Blonko. Ben does not want to have a partner and tries refusing Rook but in vain. Setting their differences aside, the two soon learn to work as a team and look out for each other.
In The More Things Change: Part 2, Ben along with Rook, investigates Undertown. They meet Psyphon who reveals that he has started a gang. Ben battles Buglizard as Shocksquatch and with the help of Rook, defeats Buglizard and arrests Psyphon and his gang members.
In A Jolt from the Past, Ben discovers that a guy named Fistrick and his gang are illegally keeping the Megawhatts. Ben and Rook free the Megawatts and arrest Fistrick and his gang. Ben also unlocks and transforms into Gravattack.
In Trouble Helix, Ben transforms into Chromastone and Cannonbolt to help Driba and Blukic to test a weapon.
In Have I Got a Deal for You, Ben meets Blarney T. Hokestar, a dealer and Pax, an alien right activist who claims Hokestar is illegally keeping a Screegit. This is proven true and since the Screegit reacts with Nitrogen gas, it creates trouble. However, it is subsequently defeated by Ben and Hokestar. Then Solid Plugg, assistant of Hokestar, and Pax are arrested.
In It Was Them, Ben is attacked by Slamworm, which is once again the work of Khyber. His suspicion arouses over these attacks. Later, he and Rook go to arrest Animo who has managed to escape. At Animo's hideout, Ben is once again attacked, this time by Mucilator. Eventually Ben and Rook manage to defeat the Mucilator and arrest Animo. Ben unlocks Crashhopper.
In So Long, and Thanks for All the Smoothies, Ben and Rook check out a mysterious ghost ship. which is revealed to be a Contumelia ship. Later on after meeting old enemies, Ben has to transform into Alien X to save the universe from the Annihilargh, a doomsday device created by the Contumelia to destroy universes. When Alien X transformed back into Ben, he gained a green and white jacket that had a hoodie, and a number 10 logo.
In Hot Stretch, Ben encounters Ester, a Kraaho, who stole a Nuclear Fusion Device. He meets Seebik, the leader of the Kraaho. Eventually, Ben develops a crush on Ester and together they put an end to Seebik's evil heist. Seebik is defeated and Ester becomes the new leader of the Kraaho.
In Of Predators and Prey: Part 1, Ben and Rook break up their partnership because of a fight and Ben's Plumber's badge is destroyed. Ben is then attacked by Khyber and his pet. He transforms into Crashhopper to battle, but Khyber's pet transforms into Mucilator and falls on Crashhopper, who transforms into Armodrillo and throws Mucilator.
Mucilator then transforms into Slamworm and goes underground, attacking Armodrillo. Armodrillo transforms into Heatblast and chases after Khyber but meets a surprise attack by Crabdozer. Then Khyber introduces himself as the 'greatest huntsman in the galaxy', However Ben just mocks him. Heatblast tries to transform into Humungousaur but transforms a new alien named Ball Weevil. At first Ben didn't know how to use Ball Weevil's powers, but then spits a ball and rolls around uncontrollably before seeing that the ball can explode. Crabdozer counters this by transforming into Terroranchula.
Ball Weevil flees, but Khyber defeats him by redirecting one of his attacks. The Omnitrix times out and Ball Weevil transforms back into Ben and falls down unconscious. Khyber then picks him up and starts gloating.
In Of Predators and Prey: Part 2, while being imprisoned in Khyber's Ship Ben eventually discovers from Khyber that Malware is also involved in the creation of the Nemetrix, the device that allows Khyber's pet to transform into predators of aliens, and that Dr. Psychobos using a corrupted blueprint of the Omnitrix retrieved by Malware, created the Nemetrix. Dr. Psychobos hired Khyber to collect Predator samples for the Nemetrix and they used Phil as a test subject. Rook then comes to Ben's rescue, revealing that their argument was part of their plan to lure Khyber and that Ben's Plumber badge was not destroyed. They manage to defeat Khyber and he crash lands. The wreckage of his ship is visited by Malware and Dr. Psychobos.
In Outbreak, the Plumber Headquarters is attacked by Dr. Psychobos who steals an Omnitrix component to perfect the Nemetrix. In the process, the now mutated Psyphon and his gang members create chaos until they are defeated by Ben, Rook and a squadron of Plumbers. Blukic and Driba manage to replace the component stolen and in this process, they unlock new aliens. Ben also unlocks Kickin Hawk as a result of scanning Liam.
In Many Happy Returns, Gwen and Kevin come to Bellwood to visit Ben. Ben defeats Looma Red Wind, a Tetramand who Kevin was engaged to, but in this process gets accidentally engaged to her.
In Gone Fishin', Magister Patelliday is kidnapped by Captain Kork and his Mechaneer while he is fishing with Max, Ben, and Rook. Max, Rook, and Ben infiltrate Kork's headquarters and rescue Magister Patelliday as well as arresting Kork.
In Blukic and Driba Go to Mr. Smoothy's, Ben and Rook are busy chasing after Trumbipulor who is after 'Ultimate Power' which is revealed to be peanuts. Blukic and Driba are busy trying to go to Mr. Smoothy to buy a grasshopper smoothie. Ben and Rook manage to defeat Trumbipulor while Blukic and Driba manage to get smoothies. Ben also learns of the existence of a 23rd store of Mr. Smoothy.
In Malefactor, Khyber and his pet attack Ben at a festival. Ben recognizes Hypnotick's species and comes to the conclusion that this is just a distraction. Ben reaches the Proto-TRUK and finds Malware stealing data from it. Malware escapes and Ben shows fear towards him in this episode.
In Arrested Development, Ben and Rook are fighting the Computron's Minions and meet Billy Billions. At first, Ben mistakes him for a fan but then it is revealed that he is controlling the robots. As it turns out, Billy had a rivalry with Ben when they were young, though it was one-sided. Amidst the rivalry, Billy fired a beam at Ben but since he was Diamondhead at that time, the beam was deflected and warped Billy to Dimension 12. Billy uses a De-Ager Ray on Ben and Rook, transforming them into young versions of themselves. Eventually, Billy accidentally causes an invasion of the robots. The robots are stopped by Ben and Rook who manage to revert to their original age. After that Billy is arrested and Ben once again shows Billy down.
In Bros in Space, Ben and Rook reach Revonnah, the home planet of Rook. Rook introduced Ben to his family and his crush. Later a Muroid attacks standing on two legs which is strange as they should walk in four legs. In the night, Ben finds out that there is a TV show about him. The next morning the Revonnahganders are harvesting and Ben tries to help them. In the end, it is revealed that Fistrick was manipulating the Muroids so that he can steal Amber Ogia, the sacred food, crop and fuel of the Revonnahganders. He is defeated with the combined efforts of Ben and the Revonnahganders.
In Ben Again, while Battling Eon, 11-year-old Ben's mind gets switched with his 16-year-old self. As 16-year-old Ben, he finds the clues laid down by the 16-year-old Ben who is inhabiting 11-year-old Ben's body. 11-year-old Ben manages to get his body back and defeats Eon. His mind gets switched with his 11-year-old self. He lays clues for the 11-year-old Ben inhabiting 16-year-old Ben's body to find. Eventually, he manages to get his body back and defeat Eon.
In Showdown: Part 1, the Faction infiltrates Galvan Prime and they plan to humiliate and kill Azmuth. Azmuth teleports Ben and Rook to help him capture Zed and Dr. Psychobos. Khyber escapes with the Nemetrix while it is revealed that Malware was on Galvan B. At the end of the episode, Galvan B is destroyed with Malware being stronger than he was never before.
In Showdown: Part 2, Ben, Rook, Azmuth, Gwen, Kevin, Max, Blukic, and Driba have a final showdown with Malware. Even Way Big is defeated by Malware. Ben then has a flashback of what happened when he was 11 and how he lost Feedback. He eventually regains Feedback by overcoming his trauma, and by absorbing the Helix's power, he defeats Malware once and for all.
In Vilgax Must Croak, Ben tries to escort Vilgax to Incarcecon, only for him to escape due to the Incurseans' intervention. In Store 23, Ben discovers a new dimension with its own version of him, whom he tutors in how to be a hero. In Special Delivery, Ben has to deliver goods for Baumann as penance for wrecking his stuff. He quickly discovers that Psyphon is once again up to no good when he tries to steal a Dwarf Star. Ben manages to unlock Toepick and defeats Psyphon with the new transformation.
In Rules of Engagement, Ben unintentionally breaks up with Julie, yet she helps him defeat Looma, with Ship's help. Ben starts going out with Ester. In T.G.I.S., Ben teams up with the Secret Saturdays to defeat Animo and V.V. Argost, developing a crush on Drew and becoming friends with Zak.
In Rad, Ben meets Rad Dudesman and teams up with him. Other episodes featuring his fight with the Incurseans culminate with Milleous' arrest and Attea's rise to power. In this arc, Ben also unlocks Astrodactyl and Bullfrag.
In Food Around the Corner, Ben helps a peace treaty to develop between the Lewodans and Appoplexians. In O Mother, Where Art Thou?, Ma Vreedle is searching for her son and threatens to destroy the sun, but Ben and his allies stop her. In Max's Monster, present-day Phil returns with a powerful transformation.
In Return to Forever, the Forever Knights attempt to destroy Undertown. Mud Is Thicker Than Water introduces Ben's Lenopan cousin, Lucy, who helps uncover how Psyphon has been getting his hands on Plumber tech. OTTO Motives features Ben, Kevin, and Rook battling a robot named Otto.
The other episodes feature Ben's fight with Albedo, culminating with Albedo being turned into an 11-year-old version of Ben, Ben unlocking Atomix, and Zed being taken into Plumber custody after Khyber abandoned her.
In Something Zombozo This Way Comes, Ben fights Zombozo, his clowns, and the Circus Freak Trio. Ben manages to defeat them, but not before into his fear of clowns returns. In Mystery, Incorporeal, Ben visits Gwen's college and defeats Michael Morningstar. As a reward for saving the day, Ben is granted an honorary degree, referring to himself as Dr. Tennyson, much to Gwen's chagrin. In Bengeance is Mine, Ben fights Vilgax's Squid Monsters, who are wreaking havoc on the city. He defeats them with the help of an ordinary plumber named Bill Gacks.
In An American Benwolf in London, Ben is rejoined with Kai Green, his former crush. With her help, he defeats the Forever Knights before they can get Excalibur. In Animo Crackers, Dr. Animo's future self goes back in time to work with his present self. Chrono Spanner, a hero from the future, meets up with Ben and, together, they defeat both Animos.
In And Then There Were None and And Then There Was Ben, the episodes that celebrated the 199th and 200th episodes of the franchise, respectively, Ben teams up with his alternate timeline counterparts to take down Vilgax and the Evil Bens.
Other episodes feature Ben's fight with Zs'Skayr and his henchmen. Ben unlocks Whampire and he manages to destroy Zs'Skayr, defeat his henchmen, and imprison the resurrected Vladat, Lord Transyl.
In Catfight, Ben went on a date with Ester. Eventually, Nyancy Chan intervened, but she was defeated and Ben resumed his date with Ester. In Collect This, Ben found out there's a show about him, run by Hokestar, Solid Plugg, Simian, and Deefus. Eventually, the Earth was sold to Collectimus, who, at the end of the episode, traded it for Ben's shirts. In The Vengers, Captain Nemesis, Kangaroo Kommando, Billy Billions, and Mazuma formed a team known as the Vengers. They try to replace Ben, but their true nature is eventually revealed to everyone.
In Cough It Up, Ben encountered Spanner again. Together, they defeated Psyphon, and the dehydrated Techadon Factory he was after was taken by Spanner. At the end of the episode, Ben revealed his suspicions regarding who he believes Spanner really is. In Blukic and Driba Go to Area 51, Ben learned how Blukic and Driba, reached Earth. Ben also managed to destroy B.L.R.R.T. and arrest Benevelon.
In No Honor Among Bros, Rook was affected by Fistrick's "bro essence" and participated in the Golden Fist Tournament. Although he won the tournament, he arrested the participants afterward, as it was an illegal tournament.
In Universe vs. Tennyson, Ben was dragged into a Celestialsapien court for recreating the Universe in So Long, and Thanks for All the Smoothies. Ben is eventually found not guilty thanks to Chadzmuth.
Other episodes featured Ben's fight with the Rooters while Kevin's true past is revealed. The battle culminated with the Rooters' defeat and their Plumber status being revoked by the Magistrata.
Clyde Five features Ben's cousin Clyde Fife and how upon obtaining the Cincotrix he becomes a hero. Rook Tales and The Final Countdown feature Rook's former sensei, Kundo, who turns into a cyborg at the end of Rook Tales and gets arrested at the end of The Final Countdown. The Ballad of Mr. Baumann features Mr. Baumann and Sheelane, who is Baumann's fiancee. Eventually, Ben helps Baumann to successfully reunite with Sheelane and Vulkanus is defeated. Breakpoint features Ben infiltrating Fistrick's gang who are committing crimes by impersonating as Ben. In the end, Fistrick and his gang are arrested.
The Color of Monkey features Argit's new company and how Simian and Rojo cause trouble. They are eventually arrested. Vreedlemania features how the entire Vreedle family upon reuniting cause havoc in Bellwood until they are stopped by Ben. Fight at the Museum features Ben helping Kai to unsuccessfully protect the Orb of Pooma Poonkoo from Exo-Skull and Subdora who capture it for Maltruant. Ester also learns that Kai and Ben are meant to be 'together' in the future from Spanner who is confirmed to be not Jimmy.
From Hedorium to Eternity features 11-year-old Ben who puts an end to Zs'Skayr's evil plan with the help of Gwen, Jonesy, Lucy, Cooper, and Kevin. Stuck on You features Khyber enlisting the help of Skurd, a Slimebiote, to operate the Nemetrix. Eventually, the Nemetrix is taken back to custody with Khyber being arrested. Skurd now joins Ben as the Omnitrix because it has more DNA samples. In The Secret of Dos Santos, Ben helps Kai to find the Temple of the Sky. Exo-Skull intervenes and Maltruant's history is revealed. Ben and Kai show feelings for each other with Kai even kissing Ben.
Malgax Attacks features how Vilgax and Albedo team up. Albedo uses Malware's remains to create the Malware Armor for Vilgax to wear so that he can defeat Ben. Albedo then attacks Azmuth, which ends up with Albedo's Ultimatrix being Disabled. Meanwhile, Ben is being defeated by Vilgax and he apologizes to Skurd and the two teams up again to defeat Vilgax. Vilgax is eventually killed by his ship's core meltdown. Also, Malware's fate is unknown as the armor oozes out of Vilgax's petrified body. Hence, it could be that Malware is still alive.
Charm School and Third Time's a Charm finish the trilogy that was started by Charmed, I'm Sure. In the trilogy, Charmcaster has turned Addwaitya and Darkstar into stone totems and plans to become the most powerful sorceress of all time. She even manages to turn Gwen, Hex, and Bezel into totems until she is cleverly beaten by Gwen and is now trapped in her own bag. Gwen acquires the Charms of Bezel and now thinks that she and Charmcaster can become friends. Addwaitya gets away and Darkstar is arrested. In The Most Dangerous Game Show, Charles Zenith hosts a show which would decide who would marry Ben. Kai wins the contest and all the girls who lost are rescued from the Null Void. Charles is arrested, Ben and Ester break up on good terms and Ben and Kai become a couple.
It's a Mad, Mad, Mad Ben World: Part 1, It's a Mad, Mad, Mad Ben World: Part 2, Fight at the Museum, Let's Do the Time War Again, The Secret of Dos Santos, The End of an Era, and A New Dawn feature the Time War. In the Time War, Maltruant puts himself back together and orders Exo Skull and Subdora to find his missing parts. After becoming whole again, he orders Eon, Exo Skull and Subdora to get some Time Beast eggs for him. Even though Ben, Rook, Ben 10,000 and Paradox intervene Eon manages to get two Time Beast eggs for Maltruant.
After this Maltruant goes to the Future and steals the Dwarf Star and the Annihilargh and fuses them to create his modified Annihilargh. Future Ben, Gwen, Kai and Spanner who reveals himself to be Ken, Ben's son fail to stop him. But then Spanner brings past Ben and Rook to help. However, Eon arrives with a chariot pulled by a Time Beast. After Eon is betrayed, Maltruant escapes to the time-stream with Ben and Rook following with the help of their Time Cycles. They eventually crash to the past where Ben meets George Washington and battles young Vilgax.
Then Ben and Rook continue their chase which leads them to a Contumelia ship. The Contumelia reveal that they create Universes, they do not destroy them. Maltruant activates his modified Annihilargh to create the Universe in his own image however the energy of the Annihilargh is absorbed by Feedback who redirects it to Maltruant dividing him into many parts. Paradox then comes revealing that Maltruant is trapped in a time loop in which he is doomed to lose. Ben and Rook than witness the creation of the Universe after parting with Skurd who joins his ancestors to seed life across the universe. At the end of this series, Ben calls Gwen and decides that he, she, Rook and Kevin are going for a road trip across the entire Universe.
In the Legacy of Chris Thorndyke, he gets more aliens that he can handle in his Omnitrix vault, even like for an example that he gets a Saiyan transformation, much to Goku's surprise and amusement, a Symbiote transformation, which enhances his alien force, but it also has to come with a price, which is it has to be an alien that is compatible so that aliens with sound, such as Echo Echo, or fire, like Heatblast, would not work, and even Cybertronian and the Omnitrix gets upgraded in the 5 Years Later design, called Uniform mode and even unlocked master control so there will be no accidental transformations like getting the wrong alien that he requested.
And he is reprised by Yuri Lowenthal in the English dub and Soichiro Hoshi in the Japanese dub. While the young version who appears in flashbacks is reprised by Tara Strong in the English dub and Toshimi Kanno in the Japanese dub. As Ben 10,000, he is reprised by Fred Tatasciore in the English dub and Koji Ochiai in the Japanese dub.