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)