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Ларри Уорд as Peter / John |
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Teresa Gimpera as Denise |
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Giacomo Rossi Stuart as Gert Muller |
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Silvana Venturelli as Annie |
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Fernando Sánchez Polack as Comisario |
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Eugenio Navarro as Dr. Durán |
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Javier de Rivera as Dr. Hernández |
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José Bastida as Peter / John (set ups) |
| Directing | Javier Setó | Director |
| Writing | Gianfranco Clerici | Writer |
| Writing | Santiago Moncada | Screenplay |
| Writing | Javier Setó | Screenplay |
| Sound | Franco Micalizzi | Music |
| Art | Arrigo Equini | Set Decoration |
| Production | Diego Alchimede | Line Producer |
| Production | Rafael Vázquez | Line Producer |
| Camera | Antonio Piazza | Director of Photography |
| Editing | Gaby Peñalba | Editor |
| Costume & Make-Up | Toñy Nieto | Assistant Makeup Artist |
| Costume & Make-Up | Adolfo Ponte | Makeup Artist |
| Directing | Gonzalo Delgrás Robles | Assistant Director |
| Directing | Cesare Semprebene | Assistant Director |
| Art | Antonio Soriano | Property Master |
| Sound | Jesús Jiménez | Sound Engineer |
| Camera | Pedro Martín | Camera Operator |
| Camera | Manuel Mateos | Assistant Camera |
| Camera | Luis Ruiz Ibáñez | Still Photographer |
| Costume & Make-Up | Eladia Jara | Costumer |
| Editing | María Carmen Ripoll | Assistant Editor |
| Directing | Ángela Cristóbal | Script Supervisor |
| Production | Bruno Evangelisti | Production Assistant |
