Scooby-Doo Debuted On This Day In 1969
Here's a brief history of the show, according to Wikipedia:
"Scooby-Doo is an American animated cartoon franchise, comprising several animated television series produced from 1969 to the present day. The original series, Scooby-Doo, Where Are You!, was created for Hanna-Barbera Productions by writers Joe Ruby and Ken Spears in 1969"
Let's take a look at the original show opening back in 1969: