When Ben 10: Alien Force ended on a cliffhanger, fans were hungry for more high-stakes action, darker narratives, and new transformations. Enter Ben 10: Ultimate Alien, the third installment in the original Ben 10 franchise, which aired from April 2010 to March 2012. For anyone searching for a definitive resource on Ben 10: Ultimate Alien all episodes, you have come to the right place. Below, we break down every season, major arc, and essential episode you need to watch.
Notable Episodes: This season introduces Eunice, a "living Omnitrix" who absorbed Gwen's DNA, and sees the return of Ben 10,000.
"Ben 10,000 Returns": Ben meets a future version of himself who uses "Ultimate Ben" powers.
As of 2026, all 52 episodes of Ben 10: Ultimate Alien are available on: