In the wake of the second world war, Professor Trevor Bruttenholm - occult investigator and guardian of the infant Hellboy - founded the Bureau for Paranormal Research and Defense to investigate and defuse the remains of the Axis's sophisticated occult-warfare projects and potential Soviet threats. Now, with the help of a handful of war-weary American soldiers and their erstwhile Soviet allies, Bruttenholm unravels the mystery of the Nazi Occult Bureau's greatest and most threatening initiative: Project Vampir Sturm.