Hellboy, a tough witty well-meaning demon and agent of the secret US Bureau for Paranormal Research and Defense, arrives with agent Sara at a cemetery where an agent went missing while investigating a prophecy about the end of the world.
Ash is charged with the murders of his friends after the horrifying events in the cabin. His story of fighting for his life against supernatural possessed people is lacking in credibility and he is put in a mental institution.
Sometime after the events of the Evil Dead movie trilogy, traumatized Ash is still haunted by nightmares, so he decides to return to the cabin in the forest with his new girlfriend and face his fears. History repeats itself.