Scooby-Doo and Scrappy-Doo (1979)

S1E16 The Ransom of Scooby Chief

Scooby returns to his childhood neighborhood, where Scrappy is spending time with his old friends, Duke and Annie. While Scrappy enjoys catching up with them, Scooby and Shaggy are suddenly abducted. Now, it falls to Scrappy and his friends to band together and save them from their captors.