Saturday Morning's Forgotten Heroes: Scooby & Scrappy Doo meet Sherlock Holmes (The Night Ghoul of Wonderworld, 1979)
In a send-up of ABC's Fantasy Island, Velma (Pat Stevens) gets to fulfill her fantasy of working with the legendary Sherlock Holmes when the Mystery Inc. team heads to London to battle "The Night Ghoul of Wonderworld". Super Friends narrator Bill Woodson is heard as a fellow traveler, and Michael Rye as a London bobby (police officer).
Scooby & Scrappy-Doo thought this would be easier, convinced that the first Ghoul they encountered was a robot, but it's never that easy. Before the season was over, another actress, Marla Frumkin, replaced Pat Stevens as Velma.