(with Adam Hughes, 2018) Hellboy in Hell: The Descent (2012) The Three Gold Whips (2013) The Death Card (2014) The Hounds of Pluto (2015) The Exorcist of Vorsk (with Todd Mignola, 2015) The Spanish Bride (2016) For Whom the Bell Tolls (2016) Hellboy and B.P.R.D.: 1952 (with John Arcudi and Alex Maleev, 2014) 1953: The Phantom Hand (with Ben Stenbeck, 2015) The Kelpie (with Ben Stenbeck, 2015) The Witch Tree (with Ben Stenbeck, 2015) Rawhead and Bloody Bones (with Ben Stenbeck, 2015) Wandering Souls (with Chris Roberson and Michael Walsh, 2016) Beyond the Fences (with Chris Roberson, and Paolo and Joe Rivera, 2016) 1954: The Mirror (with Richard Corben, 2016) Black Sun (with Chris Roberson and Stephen Green, 2016) Unreasoning Beast (with Chris Roberson and Patric Reynolds, 2016) Ghost Moon (with Chris Roberson and Brian Churilla, 2017) 1955: Secret Nature (with Chris Roberson and Shawn Martinbrough, 2017) Occult Intelligence (with Chris Roberson and Brian Churilla, 2017) Burning Season (with Chris Roberson, and Paolo and Joe Rivera, 2018) B.P.R.D.: Hollow Earth (with Christopher Golden, Tom Sniegoski, Ryan Sook and Curtis Arnold, 2002) The Soul of Venice (with Miles Gunther and Michael Avon Oeming, 2003) Born Again (with John Arcudi and Guy Davis, 2004) Plague of Frogs (with Guy Davis, 2004) Another Day at the Office (with Cameron Stewart, 2004) The Dead (with John Arcudi and Guy Davis, 2004) The Black Flame (with John Arcudi and Guy Davis, 2005) The Universal Machine (with John Arcudi and Guy Davis, 2006) Garden of Souls (with John Arcudi and Guy Davis, 2007) Killing Ground (with John Arcudi and Guy Davis, 2007) 1946 (with Joshua Dysart and Paul Azaceta, 2008) Revival (with John Arcudi and Guy Davis, 2008) Bishop Olek’s Devil (with Joshua Dysart and Paul Azaceta, 2008) Out of Reach (with John Arcudi and Guy Davis, 2008) War on Frogs #1 (with John Arcudi, Herb Trimpe and Guy Davis, 2008) The Ectoplasmic Man (with John Arcudi and Ben Stenbeck, 2008) The Warning (with John Arcudi and Guy Davis, 2008) War on Frogs #2 (with John Arcudi and John Severin, 2008) The Black Goddess (with John Arcudi and Guy Davis, 2009) And What Shall I Find There? (with Joshua Dysart and Patric Reynolds, 2009) War on Frogs #3 (with John Arcudi and Karl Moline, 2009) 1947 (with Joshua Dysart, Gabriel Bá and Fábio Moon, 2009) War on Frogs #4 (with John Arcudi and Peter Snejbjerg, 2009)