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| Pierre Clémenti | Jacob I and II |
| Stefania Sandrelli | Clara |
| Tina Aumont | Salesgirl |
| Sergio Tofano | Petrushka |
| Giulio Cesare Castello | Professor Mozzoni |
| Romano Costa | Clara's father |
| Ninetto Davoli | Student |
| Gian Paolo Capovilla | Student |
| Luigi Antonio Guerra | Student |
| Antonio Maestri | Tre Zampe |
| Mario Venturini | Professor |
| Giuseppe Mangano | Student |
| Giancarlo Nanni | Student |
| Salvatore Samperi | Student |
| Umberto Silva | Student |
A young man concocts an alter ego who has revolutionary ideas.
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