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Scooby-Doo 2: Monsters Unleashed
The Mystery, Inc. gang catches the villain, and it turns out to be Heather (Alicia Silverstone). But, no! 'Heather' is just a mask, and under the mask is presumed-dead Jake Jacobo (Tim Blake Nelson)!
Thanks, Jackson W!
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Read more about this film at The Internet Movie Database.
Buy the soundtrack CD at Amazon.com.