Scooby-Doo
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) as Fred, actress Nicole Jaffe as Velma, and musician Indira Stefanianna Christopherson as Daphne. Scooby's speech patterns closely resembled an earlier cartoon dog, Astro from "The Jetsons" (1962–63), also voiced by Messick. Seventeen episodes of "Scooby-Doo Where are You!" were produced in 1969–70. The series theme song was written by David Mook and Ben Raleigh, and performed by Larry Marks.
Scooby-Doo! The Mystery Begins
Stealing the capsule back, the gang uses a book of spells to banish the ghosts. Scooby manages to break free of his restraints and arrives just in time to subdue the Specter, who turns out to be Principal Deedle. The principal reveals that a stamp misprint was hidden within the time capsule, something that would have been worth a fortune. The time capsule was meant to be buried when the school first opened, but a flood hit the town that day and the capsule was lost in the old school underneath the new school. Deedle being determined to claim the misprint in the time capsule used the spell book to summon the ghosts to scare everyone away so he as the Specter can open the time capsule himself. As the exposed Deedle is fired from his job and is sent to prison for his crimes, the group is publicly congratulated (and un-expelled) by Grimes (who becomes the new Principal) who also apologises to the gang for falsely accusing them. In the film's ending, the group decide to stay together and solve mysteries, and they head off to "investigate some strange goings-on at the Coolsville museum", a hint to the very first episode of "Scooby-Doo, Where Are You!" and their very first case, The Black Knight Ghost.Filming took place in Vancouver, British Columbia, Canada, including Templeton Secondary School from August 4, 2008. Cartoon Network's content advisor Rob Sorcher had said, "This contemporary take on Scooby-Doo will be an exciting movie event on Cartoon Network. This project is also an anchor component of our new push into movies, our great partnership with Warner Premiere and the overall expectation of Cartoon Network programming efforts."
The trailer for "Scooby-Doo! The Mystery Begins" was first seen on the DVD of "Scooby-Doo! and the Samurai Sword", "17 Again" and "Shorts".