Seth Green Santa Claus , The Nerd , Morgue Attendant Creator, Voice, Writer, Executive Producer Matthew Senreich Creator Dan Milano Skeletor Voice Breckin Meyer Superman , Jesus Christ Voice Jason Alexander Krampus , Santa's Manager Voice Jemaine Clement Narrator Madison Dylan Mrs. Claus Voice Tom Root Voice Tom Sheppard Director Deirdre Devlin Writer Mike Fasolo Writer Douglas Goldstein Executive Producer John Harvatine IV Executive Producer Ollie Green Producer