Character Name : Colonel Floyd Graham

Original Name : Lloyd Bridges

Gender : Male

Character Name : Dr. Lisa Van Horn

Original Name : Osa Massen

Gender : Female

Character Name : Dr. Karl Eckstrom

Original Name : John Emery

Gender : Male

Character Name : Major William Corrigan

Original Name : Noah Beery Jr.

Gender : Male

Character Name : Harry Chamberlain

Original Name : Hugh O'Brian

Gender : Male

Character Name : Dr. Ralph Fleming

Original Name : Morris Ankrum

Gender : Male

Character Name : Reporter #1

Original Name : Patrick Aherne

Gender : Male

Character Name : Martian girl

Original Name : Sherry Moreland

Gender : Female

Character Name : Physician

Original Name : John Dutra

Gender : Male

Character Name : Reporter

Original Name : Kathy Marlowe

Gender : Female

Character Name : Reporter (uncredited)

Original Name : Tom Coleman

Gender : Male

Character Name : Doctor Taking Lisa's Blood Pressure (uncredited)

Original Name : James Conaty

Gender : Male

Character Name : Reporter at Press Briefing (uncredited)

Original Name : Sam Harris

Gender : Male

Character Name : Reporter #3 (uncredited)

Original Name : Judd Holdren

Gender : Male

Character Name : Reporter (uncredited)

Original Name : Stuart Holmes

Gender : Male

Character Name : Reporter (uncredited)

Original Name : Barry Norton

Gender : Male

Character Name : Reporter (uncredited)

Original Name : Cosmo Sardo

Gender : Male

Character Name : Reporter (uncredited)

Original Name : Bert Stevens

Gender : Male