Zombies have always been popular in horror-based games. Recently, you've seen them in more casual games like Plants vs. Zombies. Now, they appear in a dodgeball game called PIRATES VS. NINJAS DODGEBALL. It's a game which pits the yo-ho-ho-ers against zombies (as well as ninjas, mushroom men, and vampires) in a story, that's, well, confusing. Essentially, the ninjas, zombies, and mushroom men are threatening the pirates' existence. As to why they all end up playing dodgeball is never explained.
