| Actor | Role |
|---|---|
 Orso Maria GuerriniEttore Majorana | Ettore Majorana |
 Luigi PistilliUniversity assistant | University assistant |
| MMariella ZanettiMariella | Mariella |
| LLoredana SavelliMariella's mother | Mariella's mother |
 Annalisa FierroMariella's friend | Mariella's friend |
 Guido AlbertiS.E. Arturo Bocchini | S.E. Arturo Bocchini |
 Luigi CasellatoInspector | Inspector |
 Pietro BiondiEnrico Fermi | Enrico Fermi |
 Claudio BaglioniYoung man singing | Young man singing |
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