Ben 10: Ultimate Alien is an american animated television series that is the third incarnation of Cartoon Network's Ben 10 franchise. It was slated to premiere after the series finale of Ben 10: Alien Force, which was on March 26, 2010.1 The show itself aired on April 23, 2010. Before the title was announced, "Ultimate Alien" went under the working title of "Ben 10: Evolution".

Picking up a few weeks after where "Ben 10: Alien Force" leaves off, Ben 10: Ultimate Alien follows the now sixteen-year-old Ben. The Omnitrix has been destroyed and Ben must now learn to master the secrets of the new Ultimatrix, a gauntlet-like device that not only allows him to transform into a numerous variety of alien super heroes, but also gives him the incredible power and ability to activate evolved (or "ultimate") versions of his alien transformations.He can also transform into all of his old aliens and the aliens from the "future" episodes of "Ben 10."

Additionally, a young fan named Jimmy Jones discovers Ben’s secret identity and reveals it to the world one week after Vilgax' defeat. Faced with newfound stardom, Ben must handle his obsessive fans and skeptics. With Gwen, Kevin and Grandpa Max still at his side, Ben continues to battle alien threats to the galaxy including finding five aliens that were attacked by a villain named Aggregor.