Lino Banfi as commissario Natale Lo Gatto

Maurizio Ferrini as agente Gino Gridelli

Maurizio Micheli as Vito Ragusa

Isabel Russinova as Maria Papetti/Wilma Cerulli

Galeazzo Benti as barone Fricò

Renata Attivissimo as Addolorata Patanè

Nicoletta Boris as Annunziata Patanè

Albano Bufalini as Salvatore Calì, il farmacista

Roberto Della Casa as architetto Arcuni

Gianni Franco as dottor Pedretti, detto Bazooka

Marcello Furgiuele as il bagnino Mario

Licinia Lentini as signora Bellugi

Armando Marra as barbiere

Valeria Milillo as Manuela Bellugi

Andrea Montuschi as don Giacomo

Gianluigi Pizzetti as Ingegner Bellugi (as Luigi Giovanni Pizzetti)

Antonella Voce as Immacolata Patanè

Kaspar Capparoni as prelato inglese del Vaticano (uncredited)

Fabio Fazio as Giulio Andreotti (voice, uncredited)

Giuseppe Marrocco as uomo delle pulizie (uncredited)

Giulio Massimini as prete che introduce Lo Gatto dal Papa (uncredited)

Manuela Romano as Barbara Barletti (uncredited)