as Harold Messner
as Emil Hahn
as Joe Wilsey
as Lt. Huebner
as Dr. Bannay (uncredited)
as Herbert Bauman (Clementi's lawyer)
as Haman (voice)
as Dr. Frederick Simmons
as Prof. Malaki
as Paul Renkov
as Bendesh
as Self (archive footage) (uncredited)
as Narrator
as Maj. Erich Mueller
as Walter Brunner
