| 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 Alan Hokanson | Mrs. Lodge |
| Don Shelton | Trooper Capt. Fred Edwards |
| Director | Gordon Douglas |
| Producer | David Weisbart |
| Writer | Ted Sherdeman; Russell S. Hughes |
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