I still can’t tell if we’re looking for an old IP or a newer one. That plus the idea that it’s very popular with the GP would narrow it down.
Nightmare Alley came to mind a few days ago as a horror-adjacent property, but much like GB:AL, I don’t think it did that well at the box office to be considered popular with the GP.
Only a few IPs are in the same class as GB and BJ: Scooby Doo, Addams Family, Casper, and Gremlins.