Construction worker Oreste and young fiancee Adelaide meet Nello, a cook in a pizzeria. This love triangle often goes to communist rallies, and enjoys the filthy beaches of Ostia. Will the hostile environment pave a way to jealousy?
| Actor | Role |
|---|---|
 Marcello MastroianniOreste | Oreste |
 Monica VittiAdelaide | Adelaide |
 Giancarlo GianniniNello | Nello |
 Manuel ZarzoUgo | Ugo |
 Marisa MerliniSilvana | Silvana |
 Juan DiegoAntonio's Son | Antonio's Son |
 Fernando Sánchez PolackDistrict Head of Communist Party | District Head of Communist Party |
 Hércules CortésAmbleto di Meo | Ambleto di Meo |
 Gioia DesideriAdelaide's friend | Adelaide's friend |
| Juan DiegoDiego's son | Diego's son |
 Bruno Scipionipizzeria worker | pizzeria worker |
 Josefina SerratosaAntonia | Antonia |
| GGiuseppe MaffioliOreste's lawyer | Oreste's lawyer |
 Corrado GaipaPresidente del Tribunale | Presidente del Tribunale |
| PPaola Natalefioraio | fioraio |
 Brizio MontinaroNot listed | Not listed |
 Nerina MontagnaniNot listed | Not listed |
 Angelo CasadeiNot listed | Not listed |
 Nestore CavaricciNot listed | Not listed |
 Augusta Di VincenziWoman at market (uncredited) / Hospital visitor (uncredited) | Woman at market (uncredited) / Hospital visitor (uncredited) |