Jason (28 episodes, 1978-1979)
Dragos (28 episodes, 1978-1979)
Prof. E.J. Parsafoot (28 episodes, 1978-1979)
Capt. Nicole Davidoff (16 episodes, 1978)
Commander Canarvin (16 episodes, 1978)
The Commander (12 episodes, 1979)
Samantha (12 episodes, 1979)
Allegra (3 episodes, 1978)
Medusa (3 episodes, 1979)
Matt Daringstar (3 episodes, 1979)
Lt. Matt Prentiss / Tehor (2 episodes, 1978-1979)
Queen Vanessa (2 episodes, 1978)
Captain Kidd (2 episodes, 1978)
Adron (2 episodes, 1979)
Bork (2 episodes, 1978)
Heidi (2 episodes, 1979)
Jo-Neen (1 episode, 1979)
Karius (1 episode, 1979)
Space Cadet (unknown episodes)
Narrator / Various (uncredited) (28 episodes, 1978-1979)
Wiki / Peepo (uncredited) (12 episodes, 1978-1979)
Snow Monster (uncredited) (1 episode, 1978)