Don Megowan

Capt. Kenneth Cragis

Erica Elliott

Maxine Megan

Don Doolittle

Dr. Raven

George Milan

Acto

Dudley Manlove

Lagan

Frances McCann

Esme Cragis Milos

David Cross

Pax

Malcolm Smith

Court

Richard Vath

Mark

Reid Hammond

Hart

Pat Bradley

Dr. Moffitt (uncredited)

William Hunter

Ward (uncredited)

Gil Frye

Orus (uncredited)

Alton Tabor

Kelly (uncredited)

Paul Sheriff

Police Officer (uncredited)

Wesley Barry

Director

Wesley Barry

Producer

Hal Mohr

Director of Photography

Ted Rich

Art Direction

Ace Herman

Editor

Jack Williamson

Novel

Jay Simms

Story

Jay Simms

Screenplay

Edward J. Kay

Producer

Edward J. Kay

Original Music Composer

Morris Hoffman

Set Decoration

Jack Pierce

Makeup Artist

Karel Čapek

Original Story