S.p.a.

Following the Bureau's catastrophic encounter with the monster-god Katha-Hem, Kate heads to France with hopes of bringing Roger back to life, and Daimio reveals the truth about his death in the jungles of Bolivia. The coming frog apocalypse heats up as Abe meets a secret society of Victorian cyborgs with ties to his origins, and Liz's visions grow increasingly dire! From Hollow Earth to King of Fear–the entire war on frogs in four volumes!

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.

The Nazi occult bureau threatened to destroy the peace that followed the end of World War II. One year after the war, Professor Bruttenholm, guardian of the child Hellboy, enlisted a special task force to connect the dots between a series of massacres and a mad vampire nobleman. Now the B.P.R.D. launches an investigation of an atomic-fueled space-travel experiment that's apparently unleashed horrific monsters in the Utah desert.

The World's Greatest Barbarian Detective goes on adventures in a weird world of hard boiled fantasy. Some comic book heroes live forever. Others die all the time.

While Johann is locked in spectral combat with the spirit of a possessed prisoner of Russia's Special Sciences Service, Kate learns about the deserted town of Rampayedik and its mysterious zombie looters.