Captain Patrick Hendry

Kenneth Tobey

Acting

Nikki

Margaret Sheridan

Acting

Dr. Arthur Carrington

Robert Cornthwaite

Acting

Ned 'Scotty' Scott

Douglas Spencer

Acting

Lt. Eddie Dykes

James Young

Acting

Crew Chief Bob

Dewey Martin

Acting

Lt. Ken 'Mac' Erickson

Robert Nichols

Acting

Corporal Barnes

William Self

Acting

Tex Richards

Nicholas Byron

Acting

Dr. Stern

Eduard Franz

Acting

Dr. Redding

George Fenneman

Acting

Prof. Voorhees

Paul Frees

Acting

Prof. Wilson

Everett Glass

Acting

Dr. Lorenz

Norbert Schiller

Acting

Prof. Ambrose

Edmund Breon

Acting

Dr. Chapman

John Dierkes

Acting

Mrs. Chapman

Sally Creighton

Acting

'The Thing'

James Arness

Acting

Gen. Fogarty

David McMahon

Acting

Bill Stone (uncredited)

Bill Neff

Acting

Capt. Smith - Fogarty's Aide (uncredited)

Robert Stevenson

Acting