Kenneth Tobey character Captain Patrick Hendry
Margaret Sheridan character Nikki
Robert Cornthwaite character Dr. Arthur Carrington
Douglas Spencer character Ned 'Scotty' Scott
James Young character Lt. Eddie Dykes
Dewey Martin character Crew Chief Bob
Robert Nichols character Lt. Ken 'Mac' Erickson
William Self character Corporal Barnes
Nicholas Byron character Tex Richards
Eduard Franz character Dr. Stern
George Fenneman character Dr. Redding
Paul Frees character Prof. Voorhees
Everett Glass character Prof. Wilson
Norbert Schiller character Dr. Lorenz
Edmond Breon character Prof. Ambrose
John Dierkes character Dr. Chapman
Sally Creighton character Mrs. Chapman
William Neff character Bill Stone
James Arness character 'The Thing'
David McMahon character Gen. Fogarty
