

A killer is cleaning up the streets of Milan by murdering those considered as deviant. An ornamental dragonfly, soaked in the blood of the victim, is left on each body.

Paul Naschy
Inspector Scaporella

María Kosty
Ingrid

Erika Blanc
Silvana Scaporella

Ángel Aranda
Pietro Volpini

Ricardo Merino
Edmundo

Susana Mayo
Claudia Volpini

Eduardo Calvo
Professor Sandro Campitelli

Mariano Vidal Molina
Police Commissioner

José Canalejas
Ruggero

Ramón Centenero
Vittorio Darucchi