 | James Whitmore | .... | Police Sgt. Ben Peterson |
 | Edmund Gwenn | .... | Dr. Harold Medford |
| Joan Weldon | .... | Dr. Patricia 'Pat' Medford |
| James Arness | .... | Robert Graham |
| Onslow Stevens | .... | Brigadier General Robert O'Brien |
| Sean McClory | .... | Maj. Kibbee |
| Chris Drake | .... | Trooper Ed Blackburn |
| Sandy Descher | .... | The Ellinson Girl |
| Mary Ann Hokanson | .... | Mrs. Lodge |
| Don Shelton | .... | Trooper Capt. Fred Edwards |
| Fess Parker | .... | Alan Crotty |
| Olin Howlin | .... | Jensen |
| Richard Bellis | .... | Mike (uncredited) |
| John Beradino | .... | Patrolman Ryan (uncredited) |
| Robert Berger | .... | Patrolman Sutton (uncredited) |
| Oscar Blanke | .... | Inmate (uncredited) |
| Willis Bouchey | .... | Official at D.C. Meeting (uncredited) |
| Richard Boyer | .... | (uncredited) |
| Waldron Boyle | .... | Doctor (uncredited) |
| Alexander Campbell | .... | Official (uncredited) |
| James Cardwell | .... | Officer (uncredited) |
| Royden E. Clark | .... | Jeep Driver (uncredited) |
| John Close | .... | Pilot's Voice (uncredited) |
| Booth Colman | .... | Reporter (uncredited) |
| Walter Coy | .... | Reporter (uncredited) |
| Dean Cromer | .... | MP Sergeant (uncredited) |
| Richard Deacon | .... | Reporter (LA news conf.) (uncredited) |
| Eddie Dew | .... | Officer (uncredited) |
| Lawrence Dobkin | .... | Los Angeles City Engineer (uncredited) |
| Ann Doran | .... | Child Psychiatrist (uncredited) |
| Wally Duffy | .... | Airman (uncredited) |
| Cliff Ferre | .... | Cliff, police lab man (uncredited) |
| Norman Field | .... | Gen. James (uncredited) |
| Joseph Forte | .... | Coroner Putnam (uncredited) |
| Dean Fredericks | .... | Det. Curtis (uncredited) |
| Russell Gaige | .... | Bit Part (uncredited) |
| Otis Garth | .... | Admiral at 2nd Conference (uncredited) |
| Dorothy Green | .... | Matron (uncredited) |
| Gayle Kellogg | .... | Gunner (uncredited) |
| Kenner G. Kemp | .... | (uncredited) |
| Hubie Kerns | .... | Jeep Driver (uncredited) |
| Warren Mace | .... | Radio Operator (uncredited) |
| Chad Mallory | .... | Loader (uncredited) |
| John Maxwell | .... | Dr. Grant (uncredited) |
| Matthew McCue | .... | Grampe, Storekeeper (uncredited) |
| Charles Meredith | .... | Bit Part (uncredited) |
| Leonard Nimoy | .... | Staff Sergeant (Telex operator) (uncredited) |
| Jack Perrin | .... | Army Officer (uncredited) |
| Charles Perry | .... | Soldier (uncredited) |
| Joe Sawyer | .... | Capt. O'Connell (uncredited) |
| William Schallert | .... | Ambulance Attendant (uncredited) |
| Fred Shellac | .... | (uncredited) |
| Joel Smith | .... | Ben's Driver (uncredited) |
| Ken Smith | .... | (uncredited) |
| Douglas Spencer | .... | Reporter (uncredited) |
| Janet Stewart | .... | WAVE (uncredited) |
| Victor Sutherland | .... | Senator at D.C. Meeting (uncredited) |
| Dub Taylor | .... | Railroad Yard Watchman (uncredited) |
| Harry Tyler | .... | Inmate (uncredited) |
| Dick Wessel | .... | Railroad Detective at Boxcar (uncredited) |
| Harry Wilson | .... | Inmate (uncredited) |
Them
USA
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