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.
The Scooby-Doo Show
The Scooby-Doo Show is an American animated mystery comedy series. The title of the series is an umbrella term for episodes of the third incarnation of Hanna-Barbera's "Scooby-Doo" franchise. A total of 40 episodes ran for three seasons, from 1976 to 1978, on ABC, marking the first "Scooby" series to appear on the network. Sixteen episodes were produced as segments of "The Scooby-Doo/Dynomutt Hour" in 1976, eight episodes were produced as segments of "Scooby's All-Star Laff-A-Lympics" in 1977 and sixteen episodes were produced in 1978, with nine of them running by themselves under the "Scooby-Doo, Where Are You!" name and the final seven as segments of "Scooby's All-Stars".