Scooby Doo 2: Monsters Unleashed (2004)

Some time after their adventures in Spooky Island, Fred, Daphne, Velma, Shaggy, and Scooby attend the opening of an exhibition at the Coolsonian Criminology Museum, which commemorates their past mysteries with displays of each culprit’s monster costume. However, an individual known as the Evil Masked Figure interrupts the event, stealing two costumes using a reanimated version of the Pterodactyl Ghost. Journalist Heather Jasper Howe ridicules the entire gang, starting a smear campaign against them, taking their spoken words out of context. Concluding that an old vengeful enemy is the mastermind, the gang begins revisiting old cases. Dismissing the former Pterodactyl Ghost, Doctor Jonathan Jacobo, due to his presumed death during a failed prison escape three years ago, they suspect Jeremiah Wickles, the Black Knight Ghost and Jacobo’s recently-released cellmate.

Scooby and Shaggy, after overhearing the others criticizing their tendency to bungle every operation and especially their most recent failure to secure the Pterodactyl Ghost at the museum, resolve to better themselves and act like real detectives. Going to Wickles’ residence, the group falls through a trapdoor and into a cage targeting unwelcome callers, but escape due to Daphne’s cosmetics. Inside, the gang find an ancient Celtic text that serves as an instruction manual on how to create monsters by combining magic and science. Scooby and Shaggy find a note inviting Wickles to visit the Faux Ghost nightclub and are attacked by the Black Knight Ghost, but escape after fending it off. 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”, the byproduct of certain silver mines such as Coolsville’s old mining town.