There's a show on Boomerang called "Scooby-Doo and Guess Who", and every episode there's a new celebrity guest star.On tomorrow's episode, the gang gets some mystery-solving help from . . . AXL ROSE.(???) Turns out he's old friends with Shaggy and Scooby . . . but there's no word if their backstory involves any illicit substances. In a preview clip, Fred, Velma, and Daphne refer to him as, quote, "Singer-songwriter-musician and total rock god Axl Rose!"