The notorious monster hunter is sent to Transylvania to stop Count Dracula who is using Dr. Frankenstein's research and a werewolf for some sinister purpose.

In the final days of World War II, the Nazis attempt to use black magic to aid their dying cause. The Allies raid the camp where the ceremony is taking place, but not before a demon - Hellboy - has already been conjured. Joining the Allied forces, Hellboy eventually grows to adulthood, serving the cause of good rather than evil.