Gwen travels back in time to prevent Kevin's mutation, accidentally creating a dystopian alternate timeline.
Simian, an Arachnichimp (Spider-Monkey's species) prince, asks Ben for help recovering a sacred artifact. However, Simian's true motives are far more sinister than he lets on.
Several episodes in Season 3 aired out of their original intended order, due to Cartoon Network's scheduling decisions. The production order—listed here—differs from the U.S. broadcast order in several places. all ben 10 alien force episodes
– A heavily upgraded Vilgax defeats the champions of ten worlds and targets Earth. Ben attempts to hack the Omnitrix to unlock the Master Control, but the experiment backfires, escaping aliens disrupt the city, and Kevin is mutated into a monster made of wood, stone, and metal.
The team tracks down Alan Albright, a half-human, half-Pyronite teenager, who is being framed for causing weather anomalies. Gwen travels back in time to prevent Kevin's
– Big Chill takes control of Ben's body while he sleeps. It turns out the alien is acting on natural instinct to build a nest and lay eggs in a metal junkyard.
Vilgax breaks Ghostfreak (Zs'Skayr) out of a space prison to learn the secrets of the Omnitrix. Predictably, Ghostfreak betrays Vilgax and takes over his home planet. Vilgax is forced to turn to Ben for help. Several episodes in Season 3 aired out of
The gamble paid off. Running for , Ben 10: Alien Force became a foundational pillar of Cartoon Network's late-2000s action lineup. It introduced a recalibrated Omnitrix, a brand-new roster of ten alien transformations, and a universe-ending threat that forced former enemies to work together.
Season 3 aired from to March 26, 2010 , shifting focus away from the defeated Highbreed to a mix of standalone adventures and the return of classic villains. The season is 20 episodes long , the longest of the three seasons.
— Gwen struggles with her identity as Kevin loses control.
Episode list suggestion (concise)