Scooby-Doo is an "Ameri-canine" icon, the most beloved cartoon pooch of the past three generations. Yikes! A mysterious message sends Scooby and Shaggy to the school auditorium, but ruh roh! Looks like something spooky is going on—first Fred vanishes into thin air, and then they see witches lurking back stage! Can Scooby and the gang solve this mystery before it's curtains for them?