"Scooby and the gang are going to the racetrack for a day of fun and excitement. But they hear roaring! Then they see flashing teeth! Is there a monster lurking at the racetrack? Only Scooby-Doo can solve the mystery."
"Scooby Do and his gang go to watch a baseball game. Suddenly all the lights go out. The coach and the bulldog are missing. Scooby Doo and the gang will find them."
When the Invisible Inc gang makes computer greeting cards to raise money to invite an author to school, they solve the mystery of the author's real name.