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! Mystery Incorporated
Scooby-Doo! Mystery Incorporated (also known as Mystery Incorporated or Scooby-Doo! Mystery, Inc.) is an American animated mystery comedy-drama series; the series serves as the eleventh incarnation of the "Scooby-Doo" media franchise created by Hanna-Barbera, as well as the first that was not originally run on Saturday mornings. The series is produced by Warner Bros. Animation and Cartoon Network UK and premiered in the United States on Cartoon Network on April 5, 2010, with the next twelve episodes continuing, and the first episode re-airing, on July 12, 2010. The series concluded on April 5, 2013, after two seasons and fifty-two episodes.