Curtis Armstrong

Robot DeFault / Marf (voice)

Harland Williams

Monster Krumholtz (voice)

Maurice LaMarche

Gart / Perry / Loudmouth (voice)

Jonathan Slavin

Ogo (voice)

Megan Hilty

J.D. (voice)

Cree Summer

Spitfire / Globitha (voice)

Rhea Perlman

Nessie (voice)

Fred Tatasciore

Punch Morley (voice)

Kurtwood Smith

Mr. Wheelie (voice)

Ping Wu

Master Grabmirist (voice)

Nolan North

Hal Worth-a-ton / Uncle Kuffley / Crikey (voice)

Jeff Bennett

Snap Winsome (voice)

April Winchell

Arpa / Grandma 10010 (voice)

Jennifer Cody

Lucy (voice)

Alan Tudyk

Crazy Cousin Gizmo (voice)

Jennifer Ventimilia

Joshua Sternin

David Pressler