In this action comedy the French boxer Jo Cavalier is charmed on the train to Berlin for the Olympics in Hitler's Germany by the little boy Simon Rosenblum who asks his autograph; when it turns out his adorable young fan is a Jewish orphan in danger of persecution, he risks his one shot at Olympic glory to save Simon and his family, helped only by a German officer-gentleman who became his friend in World War I, by an adventurous escape to Switzerland, Nazi troops on their heals and braving impossible odds in roller coaster-style.
| Writing | Danièle Thompson | Writer |
| Camera | Xaver Schwarzenberger | Director of Photography |
| Directing | Gérard Oury | Director |
| Writing | Gérard Oury | Writer |
| Sound | Vladimir Cosma | Original Music Composer |
| Editing | Albert Jurgenson | Editor |
| Production | Jean-Paul Belmondo | Producer |
| Production | Alain Poiré | Producer |
| Production | Horst Wendlandt | Producer |
| Production | Thomas Schühly | Executive Producer |
| Art | Rolf Zehetbauer | Production Design |
| Production | Sabine Schroth | Casting |
| Art | Marc Frédérix | Set Decoration |
| Art | Herbert Strabel | Set Decoration |
| Costume & Make-Up | Jacques Fonteray | Costume Design |
| Sound | Alain Sempé | Sound |
