When did Rasputin find his calling to bring about Ragna Rok? How did the Visitor stay hidden on Earth for so long? And where did the legendary Sledgehammer armor really come from? These questions and more are answered in this new collection from the world of Hellboy! Hellboy creator Mike Mignola is joined by John Arcudi, Chris Roberson, Laurence Campbell, Christopher Mitten, Dave Stewart, and others to bring these hidden corners of the Mignolaverse to light.