David Maclean
Jimmy Hunt
Dr. Stuart Kelston
Arthur Franz
Army Capt. Roth
Milburn Stone
Officer Jackson
Douglas Kennedy
Officer Blaine
Charles Cane
Mrs. Wilson
Fay Baker
Kathy Wilson
Janine Perreau
Mr. Turner
John Eldredge
Kelston's Secretary
Barbara Billingsley
MP
Richard Deacon
Major Clary
Gil Herman
The Martian Intelligence
Luce Potter
Dr. Pat Blake, MD
Helena Carter
Mutant Carrying David to 'Intelligence'
Lock Martin
Second Mutant Guarding the "Intelligence"
Max Palmer
Jim the Gas Station Attendant
Todd Karns
Pentagon Chief of Staff
Frank Wilcox
Dr. William Wilson
Robert Shayne
Sgt. Baker
William Phipps
Col. Mayberry
William Forrest
Brainard (bit)
Peter Brocco
Mr. George MacLean
Leif Erickson
Mrs. Mary MacLean
Hillary Brooke
Col. Fielding
Morris Ankrum
Police Sgt. Mack Finlay
Walter Sande
Police Chief A.C. Barrows
Bert Freed
Army Sgt. Rinaldi
Max Wagner
Lt. Blair
Charles Gibb
Director
William Cameron Menzies
Production Design
Art Direction
Boris Leven
Director of Photography
John F. Seitz
Original Music Composer
Raoul Kraushaar
Editor
Arthur Roberts
Visual Effects
Jack Cosgrove
Associate Producer
Edward L. Alperson Jr.
Story
John Tucker Battle
Producer
Edward L. Alperson
Screenplay
Richard Blake
Makeup Artist
Gene Hibbs
Hairstylist
Ruby Felker
Set Dresser
Edward G. Boyle
Matte Painter
Jack Rabin
Assistant Director
Ben Chapman
Second Assistant Director
Leonard Kunody
Mechanical & Creature Designer
Howard Lydecker
Sound
Earl Crain Sr.
Irving Block
Production Manager
Script Supervisor
Mary Yerke
Special Effects
Special Effects Makeup Artist
Anatole Robbins