Jack Lemmon as Wendell Armbruster, Jr.

Juliet Mills as Pamela Piggott

Clive Revill as Carlo Carlucci

Edward Andrews as J.J. Blodgett

Gianfranco Barra as Bruno

Franco Angrisano as Arnoldo Trotta

Pippo Franco as Mattarazzo

Franco Acampora as Armando Trotta

Giselda Castrini as Anna

Raffaele Mottola as Passport Officer

Lino Coletta as Cipriani

Harry Ray as Dr. Fleischmann

Guidarino Guidi as Maitre D'

Giacomo Rizzo as Barman

Antonino Faà di Bruno as Concierge (as Antonino Faa' Di Bruno)

Yanti Somer as Nurse (as Yanti Sommer)

Janet Ågren as Nurse

María Rosa Sclauzero as Hostess

Melù Valente as Hostess (as Melu' Valente)

Aldo Rendine as Rossi

Bruno Alias as Man at Airport (uncredited)

Sergio Bruni as Singer Sergio Bruni (uncredited)

Pasquale Campagnola as Police commissioner (uncredited)

Nestore Cavaricci as Male Nurse (uncredited)

Enrico Cesaretti as Man at Airport (uncredited)

Armando De Martino as Alberto Trotta (uncredited)

Giorgio Dolfin as Waiter (uncredited)

Andrea Esterhazy as Hotel Guest (uncredited)

Ferruccio Fregonese as Man at Aiport (uncredited)

Ettore Geri as Airplane Passenger (uncredited)

Armando Giovagnoli as Baron Von Schmetterling (uncredited)

Ty Hardin as Helicopter Pilot (uncredited)

Margherita Horowitz as Hotel Guest (uncredited)

Silvio Klein as Man at Airport (uncredited)

Alba Maiolini as Woman at Airport (uncredited)

Giuseppe Marrocco as Commissionaire (uncredited)

Anna Maria Perego as Woman at Hotel (uncredited)

Luigi Scavran as Sommelier (uncredited)

Pupita Lea Scuderoni as Airline Passenger (uncredited)

Maria Tedeschi as Hotel Guest (uncredited)

Giuseppe Terranova as Commissionaire (uncredited)

Bruno Tocci as Police Escort (uncredited)

Sandra Wolff as Airplane Passenger (uncredited)

Lidia Zanussi as Hotel Guest (uncredited)

Gianni Di Segni as Policeman (uncredited)