Ben 10: Ultimate Alien is an American animated television series produced by Cartoon Network Studios. It is the third installment in the Ben 10 franchise, following Ben 10 and Ben 10: Alien Force. The series premiered on April 23, 2010, and ended on March 31, 2012, after three seasons and 52 episodes.
The show follows the adventures of Ben Tennyson, a teenage boy who can transform into various alien species thanks to a device called the Omnitrix. In Ultimate Alien, Ben unlocks a new set of alien forms, including Ultimate versions of his previous transformations. Along with his cousin Gwen and his former enemy-turned-friend Kevin, Ben fights against various villains, both old and new, while also dealing with the challenges of being a teenager.
Throughout the series, Ben learns to use his alien powers in new and creative ways, while also developing his skills as a hero. He also learns more about the history of the Omnitrix and its creators, as well as the true nature of some of his alien allies and enemies. The series features a mix of action, comedy, and drama, and has been popular with both children and adults.