Majestic Movie Studios, at a singing attraction while the Chipmunks will work at the amusement park. Little do they understand that the real Dr. Frankenstein are in a new attraction called,"Frankenstein's Castle". After Alvin compels a bus ride, they overlook their performance and become locked after closing time in the park. Dr. Frankenstein figures after the monster finds the boys and recreates the Frankenstein and that the castle is not frightening enough, it starts a wild and wacky adventure!