Someone breaks into Grim's trunk and releases his Mojo Balls, causing everyone in Endsville to be infected by supernatural rage and senselessly fight each other. Following a suspicious trail of chicken feathers, Billy, Mandy, Grim, and Irwin travel to various locations from the series such as the Underworld, Jack's pumpkin patch, and even Billy's backyard to simultaneously recover the Mojo Balls and find out who released them. After defeating the brain-eating meteor from "Little Rock of Horrors", which crashed in Billy's backyard, Billy reveals he was the one who opened Grim's trunk hoping to free "Moe and Joe". The curse Grim had put on the trunk as a failsafe measure had caused Billy to begin sprouting chicken feathers, which he had been leaving a trail of so he wouldn't get lost. The other characters are infuriated at Billy, who is beaten up by Mandy during the credits.
Gameplay
The gameplay heavily mirrors that of the Power Stone series and Shrek SuperSlam. In the game, up to four players battle in a three dimensional arena and perform light and heavy style attacks in an attempt to deplete their opponents' health and knock them out. Each stage contains elements that can affect the battle, such as enemies that will attack the players or traps that can be triggered. Most levels include multiple sub-arenas and will transition from one to the next after a short amount of time has passed, such as rising lava levels in an Underworld cavern forcing players to ride a giant snake to escape. Players can find and equip different weapons scattered throughout the arenas, such as a halberd or a club, to do additional damage. Treasure chests contain items including weapons, healing items, and Mojo Balls that restore the player's Mojo Meter. When the Mojo Meter fills once, a Mojo Smackdown can be performed where the character attacks an opponent with a barrage of attacks that will instantly knock them out. When the Mojo Meter fills twice, a Mojo Meltdown can be performed, instantly knocking out all opponents. An opponent is not fully defeated until their lives are depleted and the player or another opponent attacks them, triggering a "finishing blow" sequence. Several gameplay modes are available. In Story Mode, players must complete five battles against a series of computer-controlled opponents before culminating in a final battle with the brain-eating meteor from the episode "Little Rock of Horrors". Story Mode supports both single player and cooperative two-player play. Vs. Mode allows up to four players to battle against one another, with the option to further customize the game's rules. Mission Mode tasks players with completing specific objectives using predetermined characters in set scenarios. Additional characters, stages, costumes, and rule sets can be unlocked by completing missions, finishing Story Mode with each character, and fulfilling other objectives. The Wii version of the game incorporates some motion controls by allowing the player to swing the Wii Remote to perform heavy attacks, as well as using its infrared pointer to point at a series of onscreen targets to execute finishing moves. It also supports two control schemes: one involving the Wii Remote and Nunchuk that utilizes the said motion controls, and another that utilizes the GameCube controller.
Cast and characters
The game features fifteen fully playable characters, along with five bonus "horde characters", in-game enemies given a limited playable moveset. The voice cast of the TV series reprise their respective roles for the game with the exception of Jack O'Lantern, who is voiced by Maurice LaMarche in place of his original actor Wayne Knight. "Weird Al" Yankovic voices the in-game announcer.
The game received "mixed or average reviews" on all platforms according to the review aggregation website Metacritic. GameSpot's Greg Mueller said that while the game is fun for the "first few hours" and has "Fast-paced gameplay", the game action "gets old quickly" and has a very short story mode. IGN's Mark Bozon highlighted the presentation and appeal of the GameCube, PS2 and cancelled PC versions. Bozon later called the Wii version "a solid game with minimal Wii advantages and a few technical limitations."
