When Johnny’s elderly aunt, Aunt Jebedissa Bravo, disappears, he enlists the help of Scooby-Doo, Shaggy, Fred, Daphne, and Velma to crack the case and capture a Ghostly Gardener (who turns out to be Aunt Jebedissa, who was trying to scare Johnny away, because she does not like him and considers him an embarrassment in the Bravo family).