Ben 10: Alien Force is an American animated television series created by team Man of Action and produced by Cartoon Network Studios. It is the second series in the Ben 10 franchise and serves as a sequel to the original Ben 10 series.
The series premiered on April 18, 2008, and follows the adventures of a 15-year-old Ben Tennyson, his cousin Gwen Tennyson, and their friend Kevin Levin. In Alien Force, Ben has retired from his superhero duties, but when he puts on the Omnitrix again, he discovers that it has recalibrated, allowing him to access a new set of alien forms.
The show features a new cast of villains, including the Highbreed and the Forever Knights, and explores the backstories of characters from the original series. The show also has a more mature and serious tone than the original Ben 10, and tackles issues such as morality, responsibility, and the consequences of actions.
Alien Force ran for three seasons, with the final episode airing on March 26, 2010. It was followed by another sequel series, Ben 10: Ultimate Alien.