The sheer number of times Hanna-Barbera recycled the exact same reskinned show and got away with it is amazing.
Goober and the Ghost Chasers, Josie and the Pussycats, The Amazing Chan and the Chan Clan, Clue Club, Scooby Doo and its million reiterations... the list goes on and on.
This was right behind clue club as my favorite of the scooby clones. The fact that there always was an actual ghost along with the fake one always made it satisfying to me as a kid. Hand me that specter detector!