Michael Winslow

Plutem (voice)

Darryl Hickman

Kid Comet (voice)

Frank Welker

Cosmo / Blip (voice)

Michael Bell

Space Ace (voice)

Don Messick

Astro / Gloop / Gleep (voice)

B.J. Ward

Elektra (voice)

Alexandra Stewart

Jan (voice)

Virginia Gregg

Tara (voice)

Sparky Marcus

Dorno (voice)

Mike Road

Zandor / Tundro / Zok / ... (voice)

Casey Kasem

Announcer (voice)

Keene Curtis

Narrator (voice)

Stanley Ralph Ross

Additional Voices (voice)

Chuck McCann

Additional Voices (voice)

Richard Erdman

Additional Voices (voice)