Them! Cast and Crew
 James Whitmore - (Sgt. Ben Peterson) |
 Edmund Gwenn - (Dr. Harold Medford) |
| Joan Weldon - (Dr. Patricia Medford) |
| James Arness - (Robert Graham) |
| Onslow Stevens - (Brig. Gen. O'Brien) |
| Sean McClory - (Maj. Kibbee) |
| Chris Drake - (Officer Ed Blackburn) |
| Sandy Descher - (Little Girl) |
| Don Shelton - (Captain of Troopers) |
| Fess Parker - (Crotty) |
| Olin Howland - (Jensen) |
| John Beradino - (Ryan) |
| Willis B. Bouchey |
| Marshall Bradford |
| Alexander Campbell - (Official) |
| James B. Cardwell - (Officer) |
| Roydon E. Clark - (Jeep Driver) |
| Booth Colman - (Reporter) |
| Walter Coy |
| Richard Deacon |
| Eddie Dew |
| Ann Doran - (Psychiatrist) |
| Cliff Ferre - (Lab Man) |
| Norman Field - (General) |
| Frederick J. Foote - (Dixon) |
| Joe Forte - (Coroner Putnam) |
| Russell Gaige - (Coroner) |
| Mary Ellen Hokanson - (Mrs. Lodge) |
| Gayle Kellogg - (Gunner) |
| Charles Meredith |
| Jack Perrin - (Army Officer) |
| William Schallert - (Ambulance Attendant) |
| Ken Smith |
| Douglas Spencer - (Reporter) |
| Victor Sutherland - (Senator) |
| Dub Taylor - (Watchman) |
| Harry Tyler |
| Dick Wessel - (Cop) |
| Harry Wilson |
| Richard Bellis - (Mike) |
| Lawrence Dobkin - (Engineer) |
| Hubie Kerns Sr. |
| John Maxwell - (Dr. Grant) |
 Leonard Nimoy - (Sergeant) |
| Charles Perry - (Soldier) |
| Walden Boyle - (Doctor) |
| John Close - (Pilot) |
| Dean Cromer - (M.P. Sergeant) |
| Otis Garth - (Admiral) |
| Warren Mace - (Radio Operator) |
| Chad Mallory - (Loader) |
| Joel Smith - (Ben's Driver) |
| Janet Stewart - (WAVE) |
| Dorothy Green - (Matron) |
| Robert Berger - (Sutton) |
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