15-year-old Ben Tennyson chooses to once again put on the Omnitrix and discovers that it has recalibrated and can now transform him into 10 brand-new aliens. Joined by his super-powered cousin Gwen Tennyson and his equally powerful former enemy Kevin Levin, Ben is on a mission to find his missing Grandpa Max. | Animation, Sci-Fi & Fantasy, Action & Adventure | 3 Seasons | 46 Episodes | Series Premiere: Apr 18, 2008 | Last/Latest Episode: S03 E20 on Mar 26, 2010