Stewart Granger
David Porter
Lex Barker
Glenn Cassidy
Pierre Brice
Agent Brice
Karin Dor
Denise (Rio segment)
Walter Giller
Karl (Vienna segment)
Johanna Matz
Monique Carrar (Vienna segment)
Klaus Kinski
Gomez (Rio segment)
Richard Münch
Professor Alden (Frame story)
Peter Vogel
Wendt, Suspected girls' killer (Frame story)
Pascale Petit
Lotty (Vienna segment)
Agnès Spaak
Nelly Small (Rio segment)
Herbert Fux
Thug #2 (Vienna segment) (uncredited)
Harald Dietl
Hans, Thug #1 (Vienna segment) (uncredited)
Raoul Retzer
Doorman (Vienna segment) (uncredited)
Margaret Lee
Agent Linda (Rome segment)
Roberto Miali
Pessana (Rio segment)
Carla Calò
Female boss (Rome segment)
Carmen G. Cervera
Joana (Rio segment)
Allen Pinson
Ray Runner (Rio segment)
Fregolente
Harry Brenton (Rio segment)
Kim Camba
Gigi (Rome segment) (unconfirmed)
Fortunato Arena
Taxi driver (Rome segment) (uncredited)
Alberto Bonucci
Professor (Rome segment) (uncredited)
Pietro Ceccarelli
Gangster #2 (Rome segment) (uncredited)
Spartaco Conversi
Gangster #4 (Rome segment) (uncredited)
Franco Daddi
Gangster #3 (Rome segment) (uncredited)
Robert Favart
Sergej (Vienna segment) (uncredited)
Michael Janisch
Kurt Waldeck (Vienna segment) (uncredited)
José Lewgoy
President (Rio segment) (uncredited)
Luciano Pigozzi
Ivan (Rome segment) (uncredited)