Dr. Edward Morbius

Walter Pidgeon

Acting

Altaira Morbius

Anne Francis

Acting

Commander John J. Adams

Leslie Nielsen

Acting

Lt. 'Doc' Ostrow

Warren Stevens

Acting

Lt. Jerry Farman

Jack Kelly

Acting

Cookie

Earl Holliman

Acting

Chief Engineer Quinn

Richard Anderson

Acting

Bosun

George D. Wallace

Acting

Crewman Grey

Robert Dix

Acting

Crewman Youngerford

Jimmy Thompson

Acting

Crewman Strong

James Drury

Acting

Crewman Randall

Harry Harvey Jr.

Acting

Crewman Lindstrom

Roger McGee

Acting

Crewman Moran

Peter Miller

Acting

Crewman Nichols

Morgan Jones

Acting

Crewman Silvers

Richard Grant

Acting

Crewman (uncredited)

James Best

Acting

Crewman (uncredited)

William Boyett

Acting

Narrator (voice) (uncredited)

Les Tremayne

Acting

Robby the Robot (interior) (uncredited)

Frankie Darro

Acting

Robby the Robot (voice) (uncredited)

Marvin Miller

Acting