Deadpool: Merc with a Mouth, Volume 1: Head Trip » (Premiere Hardcover)

It's the Merc with two mouths! Deadpool travels to the Savage Land to retrieve what might be the deadliest bio-weapon the universe has ever seen. What is this deadly object? Well, Deadpool's employer is being a little vague about that. Let's just say when the secret is finally revealed, it's enough to throw even the Merc with two Mouths for a loop... Oh hell, we can't keep a secret, it's the severed-but-still-hungry head of the Marvel Zombies Deadpool! To save the universe, Deadpool must team up with himself to dodge Hydra operatives, dinosaurs, cavemen, and zombie cavemen as he attempts to take his not-so-precious cargo back where it came from: the Marvel Zombies Universe!
Collects Deadpool: Merc With a Mouth #1-6