Dr. Cal Meacham
Rex Reason
Dr. Ruth Adams
Faith Domergue
Webb
Robert B. Williams
Express Deliveryman
Coleman Francis
Exeter
Jeff Morrow
Brack
Lance Fuller
Joe Wilson
Robert Nichols
Steve Carlson
Russell Johnson
The Monitor of Metaluna
Douglas Spencer
Spacecraft Pilot
Richard Deacon
Mutant
Regis Parton
Dr. Adolph Engelborg
Karl Ludwig Lindt
Director
Joseph M. Newman
Makeup Artist
Bud Westmore
Editor
Virgil W. Vogel
Set Decoration
Julia Heron
Art Direction
Richard H. Riedel
Director of Photography
Clifford Stine
Costume Design
Rosemary Odell
Alexander Golitzen
Russell A. Gausman
Screenplay
Franklin Coen
Producer
William Alland
Hairstylist
Joan St. Oegger
Story
Raymond F. Jones
George Callahan
Visual Effects
Roswell A. Hoffmann