Princess/ Susan/ additional voices
Janet Waldo
Mark/ additional voices
Casey Kasem
7-Zark-7/Keyop/ additional voices
Alan Young
Zoltar/ The Spirit/ Cronos/ additional voices
Keye Luke
Jason/ additional voices
Ronnie Schell
Tiny Harper / Chief Anderson (voice)
Alan Dinehart
Commander Gorok/ additional voices
Alan Oppenheimer