A retired ex-criminal, the notorious Mister X, must clear his name when an up-and-comer commits a heinous copycat crime.

Pier Paolo Capponi
as Mister X

Gaia Germani
as Timy

Armando Calvo
as George Lamarro

Anna Zinnemann
as Dolly

Umberto Raho
as Jack MacDougall

Renato Baldini
as Antonio 'Joe' Caruso

Franco Fantasia
as Inspector Roux

Antonio Gradoli
as Commissioner Sebastian

Nieves Salcedo
as Veronica Strindberg

Pino Polidori
as Lembus