Schauspieler
James Whitmore (Sgt. Ben Peterson), Edmund Gwenn (Dr. Harold Medford), Joan Weldon (Dr. Patricia Medford), James Arness (Robert Graham), Onslow Stevens (Brig. Gen. Robert O'Brien), Sean McClory (Maj. Kibbee), Chris Drake (Trooper Ed Blackburn), Sandy Descher (The Ellinson Girl), Mary Alan Hokanson (Mrs. Lodge), Don Shelton (Trooper Capt. Fred Edwards), Fess Parker (Alan Crotty), Olin Howland (Jensen), Richard Bellis (Mike Lodge), John Beradino (Patrolman Ryan), Robert Berger (Patrolman Sutton), Oscar Blank (Alcoholic Ward Patient), Willis Bouchey (Official at D.C. Meeting), Richard Boyer (Trooper #1), Waldron Boyle (Doctor), Alexander Campbell (Official), James Cardwell (Officer), Steve Carruthers (Reporter), Dick Cherney (Cameraman), Roydon Clark (Jeep Driver), John Close (Johnny - Police Aircraft Pilot), Booth Colman (Reporter), James Conaty (Washington Official), Robert Scott Correll (Jerry Lodge), Walter Coy (Reporter), Lynn Craft (Washington Official), Dean Cromer (MP Sergeant), Richard Deacon (Bald Reporter), Eddie Dew (Officer), Lawrence Dobkin (Los Angeles City Engineer), Ann Doran (Child Psychiatrist), Wally Duffy (Airman), Cliff Ferre (Cliff - Police Lab Man), Norman Field (Gen. James), George Ford (Doctor), Joseph Forte (Coroner 'Doc' Putnam), Dean Fredericks (Det. Curtis), Russell Gaige (Coroner), Otis Garth (Admiral at Second Conference), Dorothy Green (Matron), Robert Haines (Reporter), Jack Henderson (Bartender), Mary Lou Holloway (Blonde), Gayle Kellogg (Gunner), Kenner G. Kemp (Trooper #2), Hubie Kerns (Jeep Driver), Paul Kruger (Washington Official), Carl M. Leviness (Reporter), Warren Mace (Radio Operator), Wayne Mallory (Loader), Lou Marcelle (Trailer Narrator), John Maxwell (Dr. Grant), Mathew McCue (Gramps Johnson - Storekeeper), Charles Meredith (Washington Official), Jan Merlin (Radio Man on the SS Viking), Forbes Murray (Government Official), Leonard Nimoy (Army Sergeant in Information Center), Jack Perrin (Army Officer), Charles Perry (Soldier), Grandon Rhodes (Alcoholic Ward Doctor)
