 | Ruth Roman als Ann Hemple Nicholson |
 | Sterling Hayden als John Emmett |
 | Werner Klemperer als Dr. Frederick Simmons |
 | Richard Gaines als Dean William Brant |
 | Charles Davis als Edward Manning Kirkpatrick aka Kirk |
 | Jeanne Cooper als Helen Bethke |
 | Peter Hansen als Karl Plesser |
 | Karl Ludwig Lindt als Dr. Reinhart Kissel |
 | John Mitchum als Bud--Deputy Sheriff |
 | John Frederick als Sheriff |
 | Leonard Bremen als Collision Shop Owner (uncredited) |
 | Sidney Clute als Mechanic (uncredited) |
 | Ken Curtis als FBI Agent Jim Anderson (uncredited) |
 | Harry Hines als Motel Owner (uncredited) |
| Tom McKee als Man from Sanitarium (uncredited) |
 | Bert Stevens als Motorcycle Cop (uncredited) |
| Henry S. Kesler | Producer |
| Bert Shefter | Original Music Composer |
| Aaron Stell | Editor |
| Donald Hamilton | Novel |
| Henry S. Kesler | Director |
| Paul Sawtell | Original Music Composer |
| Kenneth Peach | Director of Photography |
| Henry S. Kesler | Screenplay |
| Einar Bourman | Costume Design |
| Betty Pagel | Casting |
| Adele Parmenter | Costume Design |
| Herman N. Schoenbrun | Set Decoration |
| Rudi Feld | Art Direction |
| Donald Hamilton | Story |
| Turnley Walker | Story |
| Ralph E. Black | Production Supervisor |
| Horace Hough | Assistant Director |
| James Richard | Sound Editor |
| Francis J. Scheid | Sound |
| Einar Bourman | Wardrobe Designer |
| Adele Parmenter | Wardrobe Designer |
