Rex Reason
Dr. Cal Meacham
Faith Domergue
Dr. Ruth Adams
Jeff Morrow
Exeter
Lance Fuller
Brack
Robert Nichols
Joe Wilson
Russell Johnson
Steve Carlson
Douglas Spencer
The Monitor of Metaluna
Karl Ludwig Lindt
Dr. Adolph Engelborg
Regis Parton
Mutant (uncredited)
Richard Deacon
Pilot (uncredited)
Coleman Francis
Express Deliveryman (uncredited)
Robert B. Williams
Webb (uncredited)
Charlotte Alpert
Metaluna Woman at Decompression Console (uncredited)
Spencer Chan
Dr. Hu Ling Tang (uncredited)
