When does Scooby's All-Star Laff-A-Lympics return?

Scooby's All-Star Laff-A-Lympics is a two-hour Saturday morning animated program block produced by Hanna-Barbera Productions and broadcast on ABC from September 10, 1977, until September 2, 1978. Block featured five Hanna-Bbera series: The Scooby-Doo Show, The Blue Falcon & Dynomutt, Captain Caveman and the Teen Angels. During the second season in 1978–79, the show was re-titled Scooby’s All-Stars and broadcast from September 9, 1978, to December 23, 1978.