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.

Yuri Lowenthalas Ben Tennyson (voice)
Ashley Johnsonas Gwen Tennyson (voice)
Greg Cipesas Kevin Levin (voice)
Tim Curryas Dr. Chadwick / Knight #2 (voice)
Vicki Lewisas Serena (voice)
Kevin Conroyas Bellicus / Warrior 2 (voice)
Scott Menvilleas JT (voice)
Ioan Gruffuddas Devin Levin / Robot Guard (voice)
Wil Wheatonas Darkstar (voice)
John DiMaggioas Rath (voice)
Dwayne McDuffie
Charlotte Fullerton
Jim Krieg
Len Wein
Nicole Dubuc