.:SEASON 1:.
Episode 01: And Then There Were Ten
Near Earth, a battle between two spaceships takes place. Clearly outmatched, the smaller of the two fires a laser at the larger ship's bridge and launches a pod to Earth amidst the confusion. The bridge explosion nearly kills the large ship's commander, Vilgax, but the smaller ship appears to have been destroyed completely. On Earth, Ben Tennyson begins his cross-country summer vacation with his cousin, Gwen, and his paternal grandfather, Max. Ben finds the crashed pod at their first stop. Within it is a watch-like alien artifact which is called the Omnitrix. When he reaches to touch it, the watch jumps onto his wrist and refuses to come off, unwillingly merging with his DNA. Ben accidentally discovers that it can change his form into various alien creatures and quickly learns how to use it. Deciding that he could be a superhero who can actually help people, Ben uses the watch to destroy robots sent by Vilgax to steal it, thus beginning a summer of extraterrestrial adventure for himself, Max and Gwen.
Episode 02: Washington B.C.
During a trip to Washington D.C., Ben confronts Dr. Animo, a disgruntled scientist whose Transmodulator can mutate living animals, and even resurrect dead ones, and eventually learns a lesson about what being a hero really means.
Episode 08: The Alliance
Fourarms reluctantly fights a female thief named Rojo and her gang, but Vilgax sends more attack drones at the same time. While Ben shifts his attention to the drones, Rojo attacks Max, severely injuring him. Ben destroys the robots and knocks Rojo out, leaving them all at the scene in order to get Max to a hospital. While he is away, the drones fuse with Rojo, transforming her into a semi-robotic being. Vilgax makes telepathic contact with Rojo through the drones and commands her to steal the Omnitrix. At the hospital, Ben realizes that his watch makes him a constant target and puts Gwen and Max in danger by association; worried for their safety, Ben runs away. He later encounters Rojo and fights her as XLR8, which proves futile.
With advice from Max via cell phone, Ben defeats Rojo as Upgrade by merging with and shorting out her robotic parts. In the process, Vilgax makes telepathic contact with Upgrade through the drones and threatens him, claiming that he will obtain the Omnitrix some day. Ben returns to Max and Gwen upon the realization that he needs them. Max tells Ben not to worry about what Vilgax said; however, Max expresses a look of anxiousness while Ben is out of sight.
Near Earth, a battle between two spaceships takes place. Clearly outmatched, the smaller of the two fires a laser at the larger ship's bridge and launches a pod to Earth amidst the confusion. The bridge explosion nearly kills the large ship's commander, Vilgax, but the smaller ship appears to have been destroyed completely. On Earth, Ben Tennyson begins his cross-country summer vacation with his cousin, Gwen, and his paternal grandfather, Max. Ben finds the crashed pod at their first stop. Within it is a watch-like alien artifact which is called the Omnitrix. When he reaches to touch it, the watch jumps onto his wrist and refuses to come off, unwillingly merging with his DNA. Ben accidentally discovers that it can change his form into various alien creatures and quickly learns how to use it. Deciding that he could be a superhero who can actually help people, Ben uses the watch to destroy robots sent by Vilgax to steal it, thus beginning a summer of extraterrestrial adventure for himself, Max and Gwen.
Episode 02: Washington B.C.
During a trip to Washington D.C., Ben confronts Dr. Animo, a disgruntled scientist whose Transmodulator can mutate living animals, and even resurrect dead ones, and eventually learns a lesson about what being a hero really means.
Episode 08: The Alliance
Fourarms reluctantly fights a female thief named Rojo and her gang, but Vilgax sends more attack drones at the same time. While Ben shifts his attention to the drones, Rojo attacks Max, severely injuring him. Ben destroys the robots and knocks Rojo out, leaving them all at the scene in order to get Max to a hospital. While he is away, the drones fuse with Rojo, transforming her into a semi-robotic being. Vilgax makes telepathic contact with Rojo through the drones and commands her to steal the Omnitrix. At the hospital, Ben realizes that his watch makes him a constant target and puts Gwen and Max in danger by association; worried for their safety, Ben runs away. He later encounters Rojo and fights her as XLR8, which proves futile.
With advice from Max via cell phone, Ben defeats Rojo as Upgrade by merging with and shorting out her robotic parts. In the process, Vilgax makes telepathic contact with Upgrade through the drones and threatens him, claiming that he will obtain the Omnitrix some day. Ben returns to Max and Gwen upon the realization that he needs them. Max tells Ben not to worry about what Vilgax said; however, Max expresses a look of anxiousness while Ben is out of sight.
Episode 09: Last Laugh
While visiting a travelling circus, Ben fights an evil clown named Zombozo, who drains the souls of everyone watching through their laughter, all the while inhibited by a fear of clowns. Conquering his own fear, Ben defeats Zombozo by terrifying him as Ghostfreak and saves his family from the evil clown's soul draining machine. During this fight, Ben first notes that he scared himself while fighting as Ghostfreak.
While visiting a travelling circus, Ben fights an evil clown named Zombozo, who drains the souls of everyone watching through their laughter, all the while inhibited by a fear of clowns. Conquering his own fear, Ben defeats Zombozo by terrifying him as Ghostfreak and saves his family from the evil clown's soul draining machine. During this fight, Ben first notes that he scared himself while fighting as Ghostfreak.
.:SEASON 2:.
Episode 17: Gwen 10 NEW
When Ben wakes up one morning, he finds the Omnitrix missing from his arm. Weirder still is the fact that Gwen and Grandpa Max have no idea what he's talking about when he asks about it. Ben soon discovers that he's actually reliving the very first day of summer, the same day that Ben found the Omnitrix to begin with, but in an alternate reality. At the campsite, Ben tries to find the Omnitrix as it crashes to Earth, only to find out that it has already been found by Gwen. Gwen quickly adjusts to the Omnitrix's powers, with much greater ease than Ben. But Gwen uses the Omnitrix much more than required, hence when actual need for Omnitrix is required, i.e., when Vilgax attacks she finds the Omnitrix is discharged and will take some time before it becomes usable. Also, unlike the first episode Vilgax was not injured at all earlier and is already heading for Earth to take it back from her, preferably in a very painful way. Ben's going to have to prove himself to be a hero without the Omnitrix to back him up if he wants to save Gwen and give her advice on which alien to use in which situation as she finds herself at loss in that department, then as she gets captured by Vilgax and then rescued by Ben and Max, the Omnitrix flies off of Gwen and lands on Max, granting him the Omnitrix's tremendous energy and power. Aliens transformed into: Heatblast (Gwen), Grey Matter (Gwen), Diamondhead (Gwen), Fourarms (Gwen), Upgrade (Max).
When Ben wakes up one morning, he finds the Omnitrix missing from his arm. Weirder still is the fact that Gwen and Grandpa Max have no idea what he's talking about when he asks about it. Ben soon discovers that he's actually reliving the very first day of summer, the same day that Ben found the Omnitrix to begin with, but in an alternate reality. At the campsite, Ben tries to find the Omnitrix as it crashes to Earth, only to find out that it has already been found by Gwen. Gwen quickly adjusts to the Omnitrix's powers, with much greater ease than Ben. But Gwen uses the Omnitrix much more than required, hence when actual need for Omnitrix is required, i.e., when Vilgax attacks she finds the Omnitrix is discharged and will take some time before it becomes usable. Also, unlike the first episode Vilgax was not injured at all earlier and is already heading for Earth to take it back from her, preferably in a very painful way. Ben's going to have to prove himself to be a hero without the Omnitrix to back him up if he wants to save Gwen and give her advice on which alien to use in which situation as she finds herself at loss in that department, then as she gets captured by Vilgax and then rescued by Ben and Max, the Omnitrix flies off of Gwen and lands on Max, granting him the Omnitrix's tremendous energy and power. Aliens transformed into: Heatblast (Gwen), Grey Matter (Gwen), Diamondhead (Gwen), Fourarms (Gwen), Upgrade (Max).
.:SEASON 3:.
Episode 27: Ben 10,000When Ben and Gwen forget about Grandpa Max's birthday cake, the two kids wind up bickering over who's to blame. But when a mysterious stranger appears out of nowhere and kidnaps Gwen, Ben follows her into a strange portal as XLR8. When the dust settles, Ben suddenly realizes where he is: the future, in a world where humans and aliens live peacefully. Ben, however, is taken aback when he learns that Gwen's captor is actually her own future self, an accomplished magician to boot. Future Gwen reveals that the current Ben is now a world-renowned hero with 10,000 different alien forms. But, upon meeting his future self, Ben realizes that the future Ben is all business and just can't relax, not even for his own family.
Episode 28: Midnight Madness
While visiting a mega-mall, Ben and Gwen watch a hypnotist perform. Gwen volunteers Ben as a test subject, and the host, Sublimino, successfully hypnotizes him. When asked to act like an alien, Ben naturally turns to the Omnitrix and almost changes in front of the audience. Even though he is stopped by Gwen, the trouble doesn't end there. Sublimino is able to use those he hypnotizes to commit crimes in their dream state, and the alien-equipped Ben proves to be the perfect accomplice. Using Ben, Sublimino is able to steal parts to make a much bigger hypnotism device, this time hypnotizing everyone in the mall including Gwen and Grandpa. But Ben escapes the hypno beam. Ben stops him as Wildvine and Sublimino is presumably arrested. Ben finds Sublimino's hypno watch and hypnotizes Gwen to feed him ice cream that ends up all over his head.
Episode 29: A Change of Face
While Ben and family are visiting Salem, Massachusetts, Charmcaster attacks in an attempt to switch bodies with Ben; however, Gwen interferes, causing Charmcaster to switch with her instead. Gwen gets arrested and sent to juvie, where she meets two delinquent girls named Pinky and Missy, in Charmcaster's body while Charmcaster stays with the unaware Ben and Max and tries to cook up another body-transfer spell. Gwen stops Pinky and Missy from escaping using two clay animals as she escapes from juvie and returns, convincing Ben of the truth before Charmcaster tries again. However, Charmcaster manages to swap their bodies once more, ending with Charmcaster in her true body while Gwen and Ben have switched. The two swap back as a result of Charmcaster's third body-swap spell and Cannonbolt defeats Charmcaster. Ben as Cannonbolt ties up Charmcaster. Gwen punches Charmcaster out as revenge for taking over her body. Gwen ends up taking Charmcaster's spellbook for her own use and in hopes of building up her magic. Charmcaster is back in juvie where Pinky and Missy come in and prepare to give her a beating.
Episode 32: Game Over
Ben and Gwen are playing the Sumo Slammer video game and Gwen is beating Ben at it. As a result, Ben turns into Upgrade and merges with the computer so he can lower Gwen's score. As Gwen tries to get Ben out, lightning hits the van and zaps them both into the game. It isn't long before they realize that all of the aliens in the Omnitrix are unavailable and they have to collect tokens in order to activate certain ones. They progress through the levels in order to get the Upgrade token and allow them to leave the game. However, the villain of the game hears them, and wants to use the Upgrade token to leave the game and take over the real world.
Episode 33: Super Alien Hero Buddy Adventures
When a television show called Super Alien Hero Buddy Adventures, which stars corny cartoon versions of Fourarms, Heatblast, and Wildmutt, shows up, Ben gets angry and demands credit. Furthermore, it has replaced his favorite show, Kangaroo Commando. It just so happens Ben and Gwen are visiting Planetary Studios at the time, so he tries to confront the producer about it. Meanwhile, strange accidents begin occurring around the actor who plays The Commando, conveniently allowing the actor to save the day. The Commando suspects that the artist producing the cartoon, Tim Dean, is responsible, but Gwen suspects foul play on the Commando's part.
Episode 34:UnderWraps
In order to teach Ben and Gwen the value of hard work, Grandpa Max takes them to a farm. However, Todd, a son of a farmhand named Joan Maplewood tells Ben and Gwen of a mummy that had recently arrived in a flash of purple lightning, prompting their curiosity. The two of them find it digging for a strange stone, but it attacks them as soon as they see it. XLR8 fights it to no avail, but the mummy flees in the confusion. Max discovers that the strange rock is an unstable chemical called "Corrodium," which causes severe mutation in earthly organisms. The Tennysons track the mummy down to an ice cream factory, but end up in danger when the mummy proves to be invincible. In the resulting struggle, the mummy touches the Omnitrix and inadvertently adds its DNA, allowing Ben to use that form; however, the Omnitrix decides to transform Ben into Upgrade instead. Upgrade possesses a liquid nitrogen containment tank and sprays the mummy with the chemical, effectively freezing it. The family then flees the farm for fear of more manual labor.
Episode 38:Be Afraid of the Dark
Ben is now facing both a revived Ghostfreak and Doctor Vicktor, quickly transforming into Grey Matter to escape. Grey Matter is able to discern Ghostfreak's plan from a computer terminal: Using the corrodium to amplify the power source of the orbiting space station, in conjunction with the device the alien werewolf built in New Mexico, Ghostfreak is intent on covering the daylight side of the Earth in a corrodium shield. This will not only mutate Earth's population, but it will also block out the sun, giving Ghostfreak a world of eternal darkness to rule over. Ben uses Upgrade to create a makeshift rocket to get to the space station, which Vicktor clings to so that he might also get to the station. Meanwhile, Max and Gwen fight the mummy aboard the space center and attempt to thwart Ghostfreak's plan from there. Upgrade seemingly defeats the mummy, but Ghostfreak appears again and manually starts the device. In pure darkness, Ghostfreak's form enhances; Ben's new Benvicktor form holds him off until Doctor Vicktor returns. However, Max tricks Vicktor into destroying the projector, ruining Ghostfreak's plan and apparently killing the werewolf. In a fit of rage, Vicktor attempts to warp Ben away, but accidentally banishes himself and the mummy. Ben and Gwen escape with Max on the shuttle, on which they again expose Ghostfreak to sunlight and defeat him. Cannonbolt protects Gwen and Max from atmospheric reentry, and the three land in Egypt. In the aftermath of the attack, Ben realizes that he has regained Ghostfreak's natural form on the Omnitrix.
Episode 39:The Visitor
Two snowmobilers accidentally release an alien named Xylene from a strange container. Xylene locates the Omnitrix and attacks Ben, under the impression that he had stolen it. However, when Max comes to defend, the two recognize each other as old friends. Xylene and Max reminisce later that night. As Wildvine spies on them, Xylene asks Max to leave Earth and travel through the Universe with her. Distraught, Ben runs back to the campsite, where he is unable to ward off an attack by one of Vilgax's remaining drones and has to rely on Max and Xylene for help. There, Xylene reveals that she was the commander of the ship bringing the Omnitrix to Earth when Vilgax attacked it, and that she had intended to send it to Max; Ben received the Omnitrix by accident. Ben runs off in shock and Gwen follows. The drone attacks again and captures Max. Ben and Xylene reluctantly team up to save him. In the process, Xylene uses her knowledge of the Omnitrix to unlock a new form, Upchuck, which Ben uses to destroy the robot. At that, Xylene prepares to leave the planet and repeats her offer to Max. Max declines, claiming that Ben and Gwen are his whole world.
.:SEASON 4:.
Episode 41:Divided We StandDr. Animo has just escaped from prison with the help of a mutated seagull, plotting to get revenge on Ben once again, who is at the beach with Gwen and Max. Ben is being impulsive as no one will play with him, until he is confronted by Animo's seagull. During the fight, Ben discovers a new alien on the Omnitrix, Ditto, who has the power to multiply at will. Ben manages to drive of the seagull and enjoys playing as his multiple ditto copies. However one of Ben's Ditto clones is captured by Animo himself, in hopes of exploiting his alien DNA for his own evil purposes. Using the alien DNA, Animo creates an army of self-multiplying mutant Stinkflies, but Ben exploits the inherent weakness in the clones to destroy every Stinkfly clone and capture Dr. Animo once more.
Episode 42:Don't Drink the Water
Growing weak with old age, Hex is seeking out something to make him stay young. At the same time, Max is having difficulties with his aging body, so he decides to impress his grandkids at a fair to show them he's not as elderly as he seems. At the dunking game Max challenged them to, he and Ben both get splashed, unaware that the water is from the Fountain of Youth. Max regresses into a ten-year-old while Ben becomes a four-year-old. The booth's owner is Hector, the guardian of the fountain, having been charged to do so by Juan Ponce de León 400 years previously. Hex manages to force the man into revealing the location of the fountain, which he uses to become young again. However, Ben uses Heatblast to vaporize the fountain, in the process exposing Hex to enough of the water to turn him into an infant. With the fountain gone, the man reveals that the effects of the water will wear off without constant exposure. Meanwhile, Charmcaster finds her infant uncle and enjoys taunting him at his expense.