Ben and a mysterious girl from his past must prevent an alien threat from destroying the world.
Ryan Kelley
Ben Tennyson
Galadriel Stineman
Gwen Tennyson
Nathan Keyes
Kevin E. Levin
Alyssa Diaz
Elena Validus
Herbert Siguenza
Victor Validus
Barry Corbin
Grandpa Max Tennyson
Dee Bradley Baker
Big Chill / Humongousaur (voice)
Alex Winter
Nanomech (voice)
Wendy Cutler
Alien Chip Queen (voice)
Joyce Kurtz
Computer (voice)
Patrick Cox
Big Ed
Jeremy DeCarlos
Helio
Eric Mendenhall
Fitz
Tony Larkin
Ship-It Clerk
