Terence Stamp

as Padre Andreani, poi Papa Giovanni Clemente I

Fabrizio Bentivoglio

as Padre Bruno Martello

Paula Molina

as Nina

Gabriele Ferzetti

as Cardinale Ixaguirre

José Luis López Vázquez

as Don Perrone

Antonio Marsina

as Vittorio

Adriano Amidei Migliano

as Dottore

Eduardo Fajardo

as Rettore

Frank Nuyen

as Cardinal (uncredited)

Adriana Colombo