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.
Fred Jones (Scooby-Doo)
Originally named "Ronnie" when production for "Scooby-Doo" began in spring 1969, Fred was named by and after Fred Silverman, who was then head of daytime programming at CBS and a key member of the show's development team. Frank Welker, a young comedian and impressionist, was asked by the network to audition for the voice of Fred, although he had originally intended to audition for first Scooby-Doo (whom he eventually did get to voice after Don Messick died in 1997) and later Shaggy (Casey Kasem, who was cast as Shaggy, had originally wanted to voice Fred). Being cast as Fred led to the start of a long, prolific career in voice work for Welker, with "Scooby-Doo" being his first voice acting job.