Join the Mystery Inc. gang as they take on their biggest challenge yet! When they're invited to Spooky Island, a popular amusement park, they soon discover that the attractions aren't the only things that are spooky. Strange things are happening, and it's up to Scooby, Shaggy, Fred, Daphne, and Velma to uncover the truth behind the mysterious happenings.
The Mystery Inc. gang must save Coolsville from an attack of past unmasked monsters brought to life by an evil masked figure trying to "unmask" the gang.