At Coney Island, Mystery Inc. investigates when the devil appears at the old amusement attractions, and on Velma's birthday they set up a fake mystery for her to solve.
Come celebrate with Scooby and the gang, this Fourth of July! There'll be sand, sailing and, of course, a monster made of fireworks. Well, two out of three ain't bad.
World Weekly News is a supermarket tabloid newspaper on the verge of cancellation. So they call the gang for help investigating a real story about an alien encounter! But could it all be a hoax?
The Mystery, Inc. team investigates the appearance of devils at Coney Island. Then, they attempt to celebrate Velma's birthday, but Velma is delayed by helping a poisoned woman stop an attempted murder.