The visit turns into a mystery to find the missing Aunt Jebedissa and the prime suspect is a Ghostly Gardener, who turns out to be Jebedissa trying to scare Johnny away because she sees him as a family embarrassment.
Johnny Bravo is stranded on the side of the road on the way to his Aunt Jebedissa Bravo’s creepy old house when he hitches a ride on the Mystery Machine with Scooby-Doo, Shaggy, Fred, Daphne, and Velma.