A group of young friends convene in the countryside to shoot a horror movie. But an experiment with LSD sees normal boundaries between them collapsing, and tragedy subsequently striking.

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.