James Woods
Gloomius Maximus (voice)
Kyle Fairlie
Spaceboy / Young Dad (voice)
Joshua Tucci
Billy Bevel (voice)
Kristen Bone
Zowie (voice)
Cole Caplan
Olie (voice)
Rob Smith
Spot / Spacedog (voice)
Catherine Disher
Mom / TV Journalist (voice)
Rebecca Brenner
Pollie Pi (voice)
Noah Reid
Screwy (voice)
Al Mukaddam
Wheelie (voice)
Len Carlson
Pappy / TV Announcer (voice)
Adrian Truss
Dad / Gizmo (voice)
Michael Cera
Young Gizmo (voice)
Paul Haddad
Willy Jollie (voice)
Juan Chioran
Wally Jollie (voice)
Neil Crone
Doctor Geary (voice)
Philip Williams
Baxter (voice)
Ellen-Ray Hennessy
Bonita (voice)
Sunday Muse
Binky (voice)
Jake Goldsbie
Junior Littlegreen (voice)
Richard Binsley
Gene Littlegreen (voice)