Book 1

In 2001, Hellboy quit the B.P.R.D., leaving Abe Sapien, Liz Sherman, and a bizarre roster of special agents to defend the world from any occult threats, and the growing menace of the frog army.
Mike Mignola and Dark Horse present the complete Plague of Frogs saga in four volumes, from Hollow Earth to King of Fear. This first book explores the Bureau for Paranormal Research and Defense after Hellboy's departure, cracks open the secrets of Abe Sapien's origin, and sets the war on frogs in motion.

Book 2

In 2001, Hellboy quit the B.P.R.D., leaving Abe Sapien, Liz Sherman, and a bizarre roster of special agents to defend the world from the growing menace of the frog army. While Abe dives deeper into his origins, Liz and the B.P.R.D. fight against two of their greatest villains yet with their newest recruit, Daimio!

Book 3

Following the Bureau's catastrophic encounter with the monster-god Katha-Hem, Kate heads to France with hopes of bringing Roger back to life, and Daimio reveals the truth about his death in the jungles of Bolivia. The coming frog apocalypse heats up as Abe meets a secret society of Victorian cyborgs with ties to his origins, and Liz's visions grow increasingly dire! From Hollow Earth to King of Fear--the entire war on frogs in four volumes!

Book 4

A story that began in the first issue of Hellboy concludes with the B.P.R.D. team set to permanently wipe out the subterranean colony of frog monsters. The team tracks down Memnan Saa's hideout, but soon find themselves in over their heads when old enemies like the Black Flame arrive to lay waste to the world. This is the fourth (of four) softcover collections of the Plague of Frogs storyline each one collecting three of the original B.P.R.D. trades.