Paul Hubschmid

John McLaren

Madeleine Fischer

Katy Dandridge

Fiorella Mari

Mary McLaren

Ivo Garrani

Professor Herbert Weisse

Dario Michaelis

Peter Leduq

Sam Galter

Randowsky

Jean-Jacques Delbo

Sergei Boetnikov

Peter Meersman

General van Dorff (uncredited)

Massimo Zeppieri

Dennis McLaren (uncredited)

Annie Bernal

Lab Assistant (uncredited)