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 (character)
Scoobert Doo is the eponymous character and protagonist of the animated television franchise Scooby-Doo created in 1969 by the American animation company Hanna-Barbera. Scooby-Doo is a male Great Dane and lifelong companion of amateur detective Shaggy Rogers, with whom he shares many personality traits. Named after a nonsense vocal line in Frank Sinatra's hit song "Strangers in the Night", he features a mix of both canine and human behaviors (reminiscent of other funny animals in the Golden age of American animation), treated by his friends more or less as an equal while speaking in a famous (and much parodied) speech impediment. His catchphrase is "Scooby-Dooby-Doo!"