Theorem

A wealthy Italian household is turned upside down when a handsome stranger arrives, seduces every family member and then disappears. Each has an epiphany of sorts, but none can figure out who the seductive visitor was or why he came.

• 
  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
• 
  Giovanni Ivan Scratuglia

  Lucia's second lover