A mysterious murderer has already killed seven people using the deadly venom of a snake from Martinique which causes immediate death with the victim's face turning into a horrible mask. A young and ingenious police lieutenant is called on the case
Bob Rawling
Saverio Vallone
Betty
Michela Miti
Inspector Sanders
Tony Valente
Michel Clinford
Susan
Deborah Ergas
Alessandra Izzo
Gianfranco Gallo
Mrs. Sanders
Sacha Darwin
Harriet Anderson
Solvi Stübing
Louis Dek
Harry Francis
Gianni Dei
Lara Orfei
Mirta Francis
Laura Troschel
Chief of Police (as Giorgio Ardisson)
George Ardisson
Julie Garrett (as Jeannette Len)
Giovanna Lenzi
The Narrator
Linda Christian
Simonetta Gallese
Vittorio Forte
Alessandro Croce
Giovanni Nardoni
Emy Valentino