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Fred Howard
Doktor Beck / Henry / inne postaci (6 odcinków)
Jan Arvan
Profesor Henry (1952), Kruse (1953)
Robert Carson
Marshall Krone (1952) / Gubernator Willis / Sekretarz generalny (1953)
Bruce Payne
Profesor Kress (1952) / Breckrenridge (1953)
Ben Welden
Hislop / Harvey (1952) / Joe (1953) / Johnson / Sollum (1954)
Tom McKee
Duval / Casullo / Dr Owen (1953) / Ahyo (1954)
Pierce Lyden
Chaney / Sekretarz ds. stosunków międzyplanetarnych
Morgan Shaan
Axel / Strażnik / Kapitan strażników / Dowódca Eagle Claw