Screw-on Head is a robot (voiced my Paul Giamatti) who works for the Lincoln Administration (as in Abraham Lincoln.) Lincoln assigns Screw-on Head the task of hunting down Emperor Zombie. Zombie was a former Manservant of Screw-on Head, whose "taste for ancient, forbidden knowledge" led him to the dark side. And somehow made him into a Zombie. Zombie now views Screw-on Head as his rival and he has a "petty vengeance fetish" against all of Screw's subsequent Manservants.
Assisting Emperor Zombie is a cannibal, a werewolf, a mummy, and Patience, Screw's former love whom Zombie had turned into a vampire. This sets up the worlds first Zombie/Robot/Vampire love triangle. Take that Stephanie Meyer. Screw-on head and his Manservant (the 7th since Zombie) track the motley crew to the Temple of Gung, where Zombie plans on summoning a Demigod. The Demigod is a weird frog/dog combo that looks to be straight out of HP Lovecraft.
Obviously I loved this. How could you not love something that combines Zombies, Werewolves, Robots, Vampires, Cannibals, and Abraham Lincoln. It's like Night at the Museum directed by Wes Craven. Highly Recommended.