For some sobering reading, check out this link
Death tolls
Allthough all numbers are unreliable and metodes of estimation varies (some numbers counts secondary effects like starvation and disease, some don't)
Hitler outkills the Japs 2 to 1.
Lifetime "achievments" of both Stalin and Mao beats Hitlers easily.
Back on topic:
Every movie in history with a roman numeric in the title.
Except: Alien II and III and Mad Max II