Shaggy and Scooby-Doo Get a Clue

Don't Get a Big Head (2x10)

Air date: Feb 16, 2008

Dr. Phibes, tired of being outsmarted by our heroes, revises his nano formula to increase his IQ. It also inflates his head. Now, Shaggy and Scooby must stop him from releasing a gas that will drastically lower the world's intelligence.