Fred Jones, Daphne Blake, Velma Dinkley, Shaggy Rogers and Scooby-Doo travel to an amusement park called Kiss World to see Kiss at their big Halloween concert and solve a mystery, mostly because Daphne has a crush on Starchild, much to Fred's jealousy. After Scooby and the gang arrive, security chief and former government defense employee Delilah Domino refuses to let them in, so they sneak in and are caught by Delilah. At that moment, Kiss arrives, and after the gang explains that they are there to help, they tell Delilah the kids are free to stay, to which she reluctantly agrees. The Demon initially opposes to the idea due to Scooby accidentally spraying a water gun on him when he came to Shaggy and Scooby for a surprise visit but later relents. As the gang split up for clues, Shaggy and Scooby are chased by an entity; Kiss comes to their aid. They tell the gang that the entity is called the Crimson Witch, and she has been terrorizing the park for a while, and they need her to disappear before the concert.