The Grim Adventures of Billy & Mandy is a fighting game based on the television series of the same name. It was developed byHigh Voltage Software and published by Midway. The PlayStation 2 version's DVD compatibility feature came with behind the scenes footage and the season one episode "Little Rock of Horror". The game was released on many Nintendo consoles in theUnited States, but only on the Wii in the United Kingdom.

When Grim's Mojo Balls get unleashed into Endsville, causing normal people to senselessly beat the tar out of each other (according to Grim, anyone touched by a Mojo Ball will be infected by supernatural rage), it's up to Billy, Mandy, Grim and Irwin to save the world. They trek through places from their episodes such as the underworld, the pumpkin patch and even Billy's backyard, following a trail of chicken feathers as they go. In the end, it turns out that Billy is to blame for the release of the Mojo Balls (he wanted to free Moe and Joe and Grim had put a curse on his trunk to prevent it from being opened, said curse causing whoever opened the trunk to sprout chicken tail feathers) and is defeated by Mandy in the end credits (she mentioned that she hoped if the game had a mode which she and the others could just beat on Billy). During the credits you get to play as Mandy and beat Billy senseless with a flamethrower, melee attacks, and thor's hammer. (This is the only point in the game where Billy does nothing to cause damage to the player in return).

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