Paul Hubschmid
John McLaren
Madeleine Fischer
Katy Dandridge
Fiorella Mari
Mary McLaren
Ivo Garrani
Professor Herbert Weisse
Dario Michaelis
Peter Leduq
G
Gérard Landry
Randowsky
Jean-Jacques Delbo
Sergei Boetnikov
Peter Meersman
General van Dorff (uncredited)
M
Massimo Zeppieri
Dennis McLaren (uncredited)
A
Annie Bernal
Lab Assistant (uncredited)
Giacomo Rossi Stuart
Stuart (uncredited)
G
Gérard Landry
Landowsky (uncredited)
Shane Rimmer
John McLaren (uncredited) (voice)