The Joker has created a virus that infects the latest videogame craze, and turns players into zombies--but in order to defeat him Batman must first discover where he is hiding with the kidnapped creator of the videogame.
When Catwoman steals an ancient Egyptian sistrum which enables her to command all of Gotham City's cats, the city is rapidly overrun by rats and mice and it is up to Batman to find the lady and retrieve the artifact.
A mysterious villain has kidnapped hundreds of the homeless people of Gotham City and turned them into an army of mutated half-crocodile zombies led by Killer Croc, and when Batman himself is infected he must find a cure before it is too late.