The competitors aren't alone, the bad guys arrived as well to screw up everything and capture the competitors! (*Note that the bosses only appear in Adventure Mode or Boss Run mode) * Viral Wrecking Crane (Appears in the Local Neigbourhood) * Buga the Knut(from Conker's BFD; Appears in the Caveman Village) * George Volcano (Appears in the Cruise Ship area, but on an island since he threw a bottle of Volvic water at the ship) * Killer Jack-In-The-Box (Appears in the Playhouse area) * Bio-Weed (Appears in the Empty Field) * Papu Pau (Appears Out of nowhere) * Wurley (Appears in Space) * Planktondroid (Appears in Bikini Bottom) * Giant Mecha Bowser (Appears in Bowser's Basement) * Marx (Appears in the Galactic Asteroid Belt, firing lasers and other hazard