In the late 1990s, Paramount Parks-owned Canada's Wonderland collaborated with Sally Corporation to develop Scooby-Doo's Haunted Mansion.

[13] Following Cedar Fair's acquisition of Paramount Parks, the Scooby-Doo dark rides at its properties were re-themed prior to the 2010 season.

[14] During the 2014 season, Six Flags St. Louis put up a sign at the attraction that read, "Scooby-Doo Ghostblasters: The Mystery of the Scary Swamp will close permanently, September 14, 2014 for future improvements".

Also infesting Ghastley Manor is the Phantom Shadow, who at the end of the ride is caught by Scooby and Shaggy Rogers (who covers his eyes in fear) and revealed to be a counterfeiter named Dr. D.M.

The riders then enter the garage, where Ghastley isn't sent to jail as a skeleton is driving the police van with the cop trapped in a box.

The riders come across a gigantic pipe organ, where in the Canada's Wonderland version, a rendition of the classical the piece "Fantasia in G Minor BWV 542" by J.S.

Guests entered the attraction by passing under a Gothic-style arch bearing the rides name, and that was adorned on either side by the letters "GM," standing for Ghastley Manor.