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! Three stories of instrumental side characters are explored in full, collected for the first time in a handsome volume perfect for any Hellboy fan's library. 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. Collects Rasputin: The Voice of the Dragon, Sledgehammer 44, and The Visitor: How and Why He Stayed.