Un beau monstre

Virna Lisi

Nathalie Revent

Helmut Berger

Alain Revent

Charles Aznavour

Inspector Leroy

Alain Noury

Dino

Françoise Brion

Jacqueline

Édith Scob

Sylvie Revent

Marc Cassot

Vincent

Yves Brainville

Commissioner Dedru

Henri Crémieux

Professor Richet, psychiatrist

André Chanu

Doctor Schwartz

Georges Berthomieu

Toxicologist

Guy Marly

Chemist