as Mallinckroth
as Johnnie Vulkan
as Prof. Nesbitt
as Ingenieur Harald Berger
as John McLaren
as Harald Berger / Henri Mercier (in French version)
as Jean-Marc Oesterlin
as Commarro
as Dr. Jean Berner
as Georg Lindberg
as Doctor Ventoux / 'Le chat'
as Roberto Costa
as Harald Berger (as Paul Christian)
as Paul Finney, the Upperseven
as Georg
