The Scooby-Doo Movies: Wednesday is Missing
A slice of nostalgia from 1972 – I thought it was interesting considering the recent releases of the new Velma series and Wednesday:
https://www.dailymotion.com/video/x7tn6a8
* This episode is not available on home video in the U.S. due to rights issues with the Addams Family.
And... the first Scooby-Doo, Where Are You? episode, What A Night for a Knight, first aired September 13, 1969:
https://www.topcartoons.tv/cartoon/what-a-night-for-a-knight-1/