John de Lancie

as Steve

as Rama-Tut (voice) (1 episode), as Rama-Tut / Kang (voice) (1 episode)

as Granamyr (voice) (2 episodes)

as Q (uncredited)

as Q (voice) (1 episode)

as Self (1 episode)

as Ritterfau (voice) (2 episodes)

as Q (voice) (1 episode)

as Narrator

as Q (9 episodes)

as Jason Booth

as Self (1 episode)

as Dr. Johnson

as Discord (voice)

as Victor Freeze/Mr. Freeze (voice)

as Warren

as Mr. Olsen (voice)

as Himself

as Brainiac (voice) (2 episodes)

as Self

as Victor Napoli

as Sesselman (1 episode)