as Sergei Ratov
as Professor Heinrich
as Jacques Rival
as Prof. Franck
as Professor Jean Perot
as Dr. Carl Hesser
as Dr. Storm
as Hugo Schroeder
as Arnold Schmidt
as General Borelski
as Dr. Ludwig Mather
as Dr. Coutras
as Consul Magnus Barring
as Van Elst
as Van Meer
as Dr. Robert Koch
as Franz Geller
as Basil Renner
as Professor ten Brinken
as Sothis
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