as Ralf Dernburg
as Robert
as Rolf
as Brother Gaspar de Carvajal (voice) (uncredited)
as Harry Eberhardt
as Dr. Fritz Hagedorn
as Bernhard Klingenberg
as Morton Marlowe
as Rolf Bender
as Self - Narrator
as Peter Brahm
as Hans Breuer
as Wolfgang Ahrens
as Mecky Doppler
as Peter Jäger
