Ronnie Schell

as Jason (voice)

Casey Kasem

as Mark (voice)

Janet Waldo

as Princess / Susan (voice)

Alan Young

as Keyop / 7-Zark-7 (voice)

Alan Dinehart

as Tiny / Chief Anderson (voice)

Keye Luke

as Zoltar / The Spirit / Colonel Cronus (voice)

Tatsuo Yoshida

Creator