The Scooby-Doo Show You!" name and the final seven as segments of "Scooby's All-Stars". Despite the yearly changes in the way they were broadcast, the 1976–1978 stretch of "Scooby" episodes represents, at three seasons, the longest-running format of the original show before the addition of Scrappy-Doo. The episodes from all three seasons have been rerun under the title "The Scooby-Doo Show" since 1980; these "Scooby" episodes did not originally air under this title. The credits on these syndicated versions all feature a 1976 copyright date, even though some were originally produced in 1977 and 1978. Outside the United States, reruns aired on CBBC
Scooby-Doo the Night" on a flight to one of the development meetings, and decided to rename the dog "Scooby-Doo" and re-rechristen the show "Scooby-Doo, Where Are You!" The revised show was re-presented to CBS executives, who approved it for production. 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)