Lloyd Bridges
Colonel Floyd Graham
Acting
Osa Massen
Dr. Lisa Van Horn
Acting
John Emery
Dr. Karl Eckstrom
Acting
Noah Beery Jr.
Major William Corrigan
Acting
Hugh O'Brian
Harry Chamberlain
Acting
Morris Ankrum
Dr. Ralph Fleming
Acting
Patrick Aherne
Reporter #1
Acting
Sherry Moreland
Martian girl
Acting
John Dutra
Physician
Acting
Kathy Marlowe
Reporter
Acting
Tom Coleman
Reporter (uncredited)
Acting
James Conaty
Doctor Taking Lisa's Blood Pressure (uncredited)
Acting
Sam Harris
Reporter at Press Briefing (uncredited)
Acting
Judd Holdren
Reporter #3 (uncredited)
Acting
Stuart Holmes
Reporter (uncredited)
Acting
Barry Norton
Reporter (uncredited)
Acting
Cosmo Sardo
Reporter (uncredited)
Acting
Bert Stevens
Reporter (uncredited)
Acting