Capt. Kenneth Cragis
Don Megowan
Maxine Megan
Erica Elliott
Dr. Moffitt (uncredited)
Pat Bradley
Ward (uncredited)
William Hunter
Orus (uncredited)
Gil Frye
Kelly (uncredited)
Alton Tabor
Police Officer (uncredited)
Paul Sheriff
Dr. Raven
Don Doolittle
Acto
George Milan
Lagan
Dudley Manlove
Esme Cragis Milos
Frances McCann
Pax
David Cross
Court
Malcolm Smith
Mark
Richard Vath
Hart
Reid Hammond
Makeup Artist
Jack Pierce
Original Story
Karel Čapek
Director
Wesley Barry
Producer
Story
Jay Simms
Screenplay
Novel
Jack Williamson
Edward J. Kay
Original Music Composer
Director of Photography
Hal Mohr
Editor
Ace Herman
Art Direction
Ted Rich
Set Decoration
Morris Hoffman