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