Vienna, 1956. After Soviet tanks crush the Hungarian uprising, soldier-of-fortune Michael Reynolds is hired to help a threatened Hungarian scientist escape from Budapest.
| Directing | Phil Karlson | Director |
| Writing | Alistair MacLean | Novel |
| Production | Richard Widmark | Producer |
| Sound | John Williams | Original Music Composer |
| Camera | Mutz Greenbaum | Director of Photography |
| Editing | Aaron Stell | Editor |
| Writing | Jean Hazlewood | Screenplay |
| Production | Euan Lloyd | Associate Producer |
| Art | Isabella Schlichting | Art Direction |
| Art | Werner Schlichting | Art Direction |
| Costume & Make-Up | Rudolf Ohlschmidt | Makeup Artist |
| Costume & Make-Up | Margarete Pitter | Hairstylist |
| Production | Herbert E. Mendelson | Production Manager |
| Production | Edward Muhl | Executive In Charge Of Production |
| Production | Georg von Block | Production Manager |
| Directing | André Farsch | Assistant Director |
| Directing | Erich von Stroheim Jr. | Assistant Director |
| Sound | Kurt Schwarz | Sound |
| Crew | Bob Simmons | Stunt Coordinator |
| Crew | Ken Buckle | Stunts |
| Camera | Peter Allwork | Camera Operator |
| Costume & Make-Up | Leo Bei | Wardrobe Master |
| Directing | Herta Friedl | Continuity |
| Crew | Tibor Simanyi | Technical Advisor |
| Sound | Joseph Gershenson | Music Supervisor |
