Playing a Nazi in this 20th Century Fox film was James Mason who had been well-known for portraying General Rommel in Fox's earlier The Desert Rats (1953) and The Desert Fox: The Story of Rommel (1951).
Dr. Josef Mengele: You are born of the noblest blood in the world. You have it within you to fulfill ambitions one thousand times greater than those at which you presently dream, and you shall fulfill them, Bobby. You shall. You are the living duplicate of the greatest man in history.