Greg Eagles

as Grim / Sperg (voice)

Richard Steven Horvitz

as Billy (voice) (as Richard Horvitz)

Grey DeLisle

as Mandy / Doll (voice)

Malcolm McDowell

as Baron Von Ghoulish (voice)

Gilbert Gottfried

as Santa Claus (voice)

Carol Kane

as Mrs. Claus (voice)

Armin Shimerman

as General Skarr (voice)

Dee Bradley Baker

as Dad #2 / Man in Cave / Snow Monster / Bat Kid (voice)

Amber Hood

as Cassie / Elf (voice)

Richard McGonagle

as Male Parent / Man / Father Time (voice)

B.J. Ward

as Female Parent / Mother Earth / Kid #2 (voice)