Hellboy Universe Essentials: B.P.R.D.Jump on to the B. P. R. D. series and jump in to the horror fueled adventure with this introductory volume! Meet Abe Sapien, a senior agent in the Bureau for Paranormal Research and Defense. He and his fellow uncanny agents Liz Sherman, Roger the homunculus, and Johann Kraus uncover his occult origins while try to stop a plague of monstrous frog men. As it begins its spread across America, an apocalyptic new direction to Mignola's stories opens up.