<P> Scooby - Doo , Where Are You ! made its CBS network debut on Saturday , September 13 , 1969 with its first episode , `` What a Night for a Knight '' . 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 . </P>
<P> Scooby - Doo , Where Are You ! made its CBS network debut on Saturday , September 13 , 1969 with its first episode , `` What a Night for a Knight '' . 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 . </P>
when did the first scooby doo episode air
when did the first scooby doo episode air
Saturday , September 13 , 1969
Saturday , September 13 , 1969