Scooby-Doo 2: Monsters Unleashed (also referred to as Scooby-Doo 2) is a 2004 American adventure comedy film based on the animated franchise Scooby-Doo. It is the second installment in the Scooby-Doo live-action film series and the sequel to 2002's Scooby-Doo, and was directed by Raja Gosnell, written by James Gunn, and released by Warner Bros. Pictures. The film stars Freddie Prinze Jr., Sarah Michelle Gellar, Linda Cardellini, Matthew Lillard, Seth Green, Tim Blake Nelson, Peter Boyle and Alicia Silverstone, with Neil Fanning reprising his role as the voice of Scooby-Doo.

Plot

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. However, the celebrations are interrupted by a masked man known as the "Evil Masked Figure" who steals two costumes using the reanimated Pterodactyl Ghost. The gang are then ridiculed by journalist Heather Jasper Howe for failing to stop the attack, and she starts a smear campaign against them. Shaggy and Scooby, 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 an old enemy is the mastermind, the gang revisit old cases. They dismiss the former Pterodactyl Ghost, Jonathan Jacobo, as the culprit due to his apparent death during a failed prison escape. They guess that Jeremiah Wickles, the Black Knight Ghost's portrayer and Jacobo's cell mate in prison, is the culprit.