'Scooby-Doo 2: Monsters Unleashed' Set Video

The master detectives of Mystery Incorporated are back and our own Pat O'Brien has a cameo in the film. He's spreading his wings on this one, playing a reporter on the red carpet.

The gang was all there -- including Sarah Michelle Gellar and hubby Freddie Prinze, Jr. and Matthew Lillard, who was looking "shaggy."

Alicia Silverstone, who was added to the cast, plays a conniving reporter. When asked what it was like playing a reporter, Alicia told Pat: "It's really fun. I feel nervous. I was going to ask you questions earlier like, 'How do you end questions? Do you go up on the end of sentences or do you go down?'"