Nine episodes from Scooby-Doo's 1978-79 season, first run on ABC, were originally broadcast with the 1969 Scooby-Doo, Where Are You! opening and closing sequences. The entire 1978-79 series (which completed its run as part of Scooby's All-Stars and was later syndicated as part of The Scooby-Doo Show) is sometimes marketed as a third season of the original "Where Are You!" series.
Scooby-Doo, Where Are You! was a breakaway hit for Hanna-Barbera and CBS, who quickly introduced similar cartoons to accompany Scooby-Doo: Josie and the Pussycats, The Pebbles and Bamm-Bamm Show, The Funky Phantom, Speed Buggy, Jabberjaw, Captain Caveman and the Teen Angels, and Fangface.
The series began airing reruns on Cartoon Network in June 1994. Reruns on the channel remained so popular, that it was one of the few remaining classic cartoons left on the channel when reruns finally ceased in December 2008. The series returned briefly for a marathon on the weekend of September 12–13, 2009, in commemoration of the show's 40th Anniversary. In October 2012, reruns returned to the network, remaining until September 2013.