
Daphne, Velma and Fred go to the museum accompanied by the curator Patrick Wisely, but discover that the rest of the costumes have been stolen. Before fleeing, the rest of the gang had previously discovered through the book found in Wickles' mansion that the key ingredient to creating the monsters was a substance called "randomonium", which can be found at the old silver mining town. They are attacked by the Black Knight Ghost, but escape when Daphne fights him off while Velma discovers its weak spot and disables it. Scooby-Doo and Shaggy find a note inviting Wickles to visit the Faux Ghost nightclub.
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Inside, the gang find a book that serves as an instruction manual on how to create monsters. Going to Wickles' mansion, the group fall through a trapdoor and into a cage targeting unwelcome callers, but escape with the aid of Daphne's cosmetics.

Scooby and Shaggy, after overhearing the rest of the gang criticizing their tendency to bumble every operation, and especially their most recent offense in failing to secure the Pterodactyl Ghost at the museum, resolve to better themselves and become real detectives. Concluding that an old enemy of theirs is the mastermind, the gang begin revisiting old cases, dismissing the former Pterodactyl Ghost, Jonathan Jacobo, due to his apparent death during a failed prison escape three years ago, they guess that Jeremiah Wickles, the Black Knight Ghost's portrayer and Jacobo's cell mate in prison, is the culprit. The entire gang is ridiculed by journalist Heather Jasper Howe, who starts a smear campaign against them.


However, the celebrations are interrupted by a masked man known as the Evil Masked Figure who steals two costumes using the reanimated Pterodactyl Ghost. Fred, Daphne, Velma, Shaggy and Scooby-Doo attend the opening of an exhibition at the Coolsonian Criminology Museum commemorating their past solved cases with monster costumes on display.
