Curd Jürgens as Werner von Basil

Claire Bloom as Irene Andreny

Hansjörg Felmy as Hans Berger

Mario Adorf as Mirko Centowic

Hans Söhnker as Bishop Ambrosse

Rudolf Forster as Hotelmanager

Jan Hendriks as First Officer

Albert Lieven as Hartmann

Dietmar Schönherr as Rabbi

Wolfgang Wahl as Mondgesicht

Albert Bessler as Scientist

Alan Gifford as Mac Iver

Harald Maresch as Ballet Master

Karl Stepanek as Baranow

Dorothea Wieck as Countess (uncredited)

Rijk de Gooyer as Secretary (uncredited)

Susanne Körber-Harlan as Young Woman (uncredited)