The Chipmunks are performing at a theme park called Majestic Movie Studios (a spoof of Universal Studios Hollywood). While taking a break from their concert, the Chipmunks get lost, and eventually get locked inside the park. They find their way to the "Frankenstein's Castle" attraction, where a real Victor Frankenstein is working on his Frankenstein's monster. The monster is brought to life, and the doctor sends it in pursuit of the Chipmunks. In their escape, the monster retrieves Theodore's dropped teddy bear.