The Chipmunks are performing at the Majestic Movie Studios theme park and Alvin decides that the trio should use the free time between gigs to go on the park’s scariest rides. After hitching a ride on a tour bus the chipmunks find themselves hopelessly lost and that they have been locked in when the park closed for the night. Soon they discover that the park’s horror themed section has inadvertently hired the real Dr. Frankenstein, who is finalizing the process of reviving his creation.