Theorem

Terence Stamp

The Visitor

Silvana Mangano

Lucia, the Mother

Massimo Girotti

Paolo, the Father

Anne Wiazemsky

Odetta, the Daughter

Andrés José Cruz Soublette

Pietro, the Son

Laura Betti

Emilia, the Servant

Ninetto Davoli

Angelino, the Messenger

Carlo De Mejo

Lucia's first lover

Adele Cambria

Emilia, the Second Servant

Luigi Barbini

Boy at the station

Giovanni Ivan Scratuglia

Lucia's second lover

Alfonso Gatto

Doctor

Cesare Garboli

Interviewer (uncredited)

Susanna Pasolini

Old Peasant (uncredited)

Pier Paolo Pasolini

Director

Manolo Bolognini

Producer

Franco Rossellini

Producer