Tara Strong

as Ben Tennyson / Upgrade / Sandra Tennyson / Computer (voice)

Meagan Moore

as Gwen Tennyson / Girl Student (voice)

Paul Eiding

as Grandpa Max (voice)

Dee Bradley Baker

as Stinkfly / Vulpimancers / Carl Tennyson / Cash Murray (voice)

Steve Blum

as Heatblast / Mechamorph

Jim Ward

as Diamondhead

Richard McGonagle

as Four Arms / Ben’s Teacher (voice)

Fred Tatasciore

as Way Big / Evil Way Big (voice)

Richard Steven Horvitz

as Grey Matter / Dispatcher (voice)

Dave Fennoy

as Tetrax (voice)

Dwight Schultz

as Dr. Animo (voice)

Adam Wylie

as JT (voice)

Robert David Hall

as Azmuth (voice)

Troy Baker

as Retaliator / Boy Student (voice)