Paul Hubschmid

John McLaren

Madeleine Fischer

Katy Dandridge

Fiorella Mari

Mary McLaren

Ivo Garrani

Professor Herbert Weisse

Jean-Jacques Delbo

Sergei Boetnikov

Peter Meersman

General van Dorff (uncredited)

Giacomo Rossi Stuart

Stuart (uncredited)

Gérard Landry

Landowsky (uncredited)

Shane Rimmer

John McLaren (uncredited) (voice)