Character » Professor O'Donnell appears in 33 issues.
B.P.R.D. Hell On Earth
B.P.R.D. The Devil You Know
B.P.R.D. Omnibus
B.P.R.D.: The Black Flame
B.P.R.D.: Plague of Frogs
B.P.R.D.: Hell on Earth - Gods and Monsters
Dark Horse Presents
B.P.R.D.: Hell on Earth - The Transformation of J.H. O'Donnell
B.P.R.D.: Killing Ground
Abe Sapien
B.P.R.D.: Hell on Earth - Gods
B.P.R.D. Hell On Earth - The Devil's Wings
Hellboy in Mexico
Hellboy: The Complete Short Stories
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