Ben 10: Alien Force - Season 1 - Eps 1: Ben 10 Returns (1)
Ben discovers that the Forever Knights are trading weapons with the DNAliens, while at the same time, Grandpa Max has mysteriously gone missing. He decides to return the Omnitrix on his wrist and go hero once again.
About Ben 10: Alien Force

Title: Ben 10: Alien Force
First Air Date: 2008-04-18
Last Air Date: 2010-03-26
Status: Ended
Rating: 8.32/10 (from 1104 votes)
Language: EN
Seasons: 3
Total Episodes: 46
Network: Cartoon Network
Genres: Animation, Sci-Fi & Fantasy, Action & Adventure
Production Companies: Cartoon Network Studios
Synopsis
Five years later, 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. In order to save his Grandpa, Ben must defeat the evil DNAliens, a powerful alien race intent on destroying the galaxy, starting with planet Earth.
Cast

Yuri Lowenthal
Ben Tennyson (voice)

Greg Cipes
Kevin Levin (voice)

Dee Bradley Baker
Swampfire (voice)

Ashley Johnson
Gwen Tennyson (voice)