Deadpool got a job hunting down a "bioweapon" that had gone missing in the Savage Land (sort of a Land Time Forgot down in the Antarctic). Turns out the bioweapon was his own zombiefied head from a parallel universe. There were shenanigans as Deadpool and Headpool teamed up with an OC to escape from the various interested parties and, long story short, a zombie T-Rex happened. Oops.