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
For the 1977–78 season, "The Scooby-Doo/Dynomutt Show" became the two-hour programming block "Scooby's All-Star Laff-A-Lympics" (1977–78) with the addition of "Laff-a-Lympics" and "Captain Caveman and the Teen Angels". In addition to eight new episodes of "Scooby-Doo" and reruns of the 1969 show, Scooby-Doo also appeared during the "All-Star" block's "Laff-a-Lympics" series, which featured 45 Hanna-Barbera characters competing in "Battle of the Network Stars"-esque parodies of Olympic sporting events. Scooby was seen as the team captain of the "Laff-a-Lympics" "Scooby Doobies" team, which also featured Shaggy and Scooby-Dum among its members.