The main character in the movie is Frankenstein's monster. Being made of parts of reanimated corpses, the creature attracts the attention of demons. The demons are able to possess human bodies but only if those bodies have no souls, meaning that their spirits can only enter corpses which then cannot be made to speak or move. The demons hope to learn Victor Frankenstein's secret of reviving the dead and use it to take over the world. Frankenstein's monster finds himself unwittingly drawn into a secret war between demons and gargoyles, the angelic protectors of mankind.