Scooby-Doo! and the Goblin King Shaggy are allowed to keep theirs as they have proven their courage. As morning comes, Fred, Daphne and Velma forget what transpired (due to the effects of the memory-erasing spell) as Shaggy and Scooby-Doo come to pick them up. As the carnival packs up, Scooby uses an unpacked mirror one last time to spook the gang as the film ends. Some monsters from "Scooby-Doo, Where Are You!", "The New Scooby-Doo Movies", "The Scooby-Doo Show", "Scooby-Doo and Scrappy-Doo", "What's New, Scooby-Doo?" and "Scooby-Doo! and the Legend of the Vampire" are sighted in this movie: Scooby-Doo! and the Goblin King Scooby-Doo and
Scooby-Doo the Night" on a flight to one of the development meetings, and decided to rename the dog "Scooby-Doo" and re-rechristen the show "Scooby-Doo, Where Are You!" The revised show was re-presented to CBS executives, who approved it for production. The first episode of "Scooby-Doo, Where Are You!" "What a Night for a Knight" debuted on the CBS network Saturday, September 13, 1969. The original voice cast featured veteran voice actor Don Messick as Scooby-Doo, radio DJ Casey Kasem (later host of radio's syndicated "American Top 40") as Shaggy, actor Frank Welker (later a veteran voice actor in his own right)