The 13 Ghosts of Scooby-Doo

The 13 Ghosts of Scooby Doo was a Scooby-Doo film released in the 1980s and produced by Hanna-Barbera.

It was part of the sixth incarnation of the Scooby-Doo franchise and had Scooby-Doo and Shaggy meeting real monsters as opposed to men in masks.

Being a fan of Scooby-Doo, Owen Harper had seen the film and questioned as to whether Toshiko Sato had seen it. She replied with the negative. (PROSE: Slow Decay)