|
| James Whitmore | Police Sgt. Ben Peterson |
| Edmund Gwenn | Dr. Harold Medford |
| Joan Weldon | Dr. Patricia 'Pat' 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 Ann Hokanson | Mrs. Lodge |
| Fess Parker | Alan Crotty |
| William Schallert | Ambulance Attendant (uncredited) |
| Leonard Nimoy | Air Force Sergeant (uncredited) |
| Olin Howlin | Jensen |
Bug experts, a state trooper and an FBI agent track giant mutant ants from New Mexico to Los Angeles.
|
|
