Scooby-Doo and Scrappy-Doo (1979 TV series) threatening cancellation for the show, whose ratings were in decline. ABC was going to choose between two shows-Scooby-Doo or an unnamed pilot from Ruby Spears Enterprises. Therefore, for its 1979–1980 season, "Scooby-Doo" was given a major overhaul, adding the character of Scooby's nephew Scrappy-Doo, voiced by Lennie Weinrib, and changing the name of the show to "Scooby-Doo and Scrappy-Doo". Although still present in these episodes, the characters of Fred, Daphne, and Velma became less essential to the plot and Shaggy, Scooby and Scrappy were the main focus. Marla Frumkin took over Pat Stevens' role as Velma Dinkley towards the end
Scooby-Doo in 1973. Pat Stevens took over her role as the voice of Velma. For the 1977–78 season, "The Scooby-Doo/Dynomutt Show" became the two-hour programming block "Scooby's All-Star Laff-A-Lympics" (1977–78) with the addition of "Laff-a-Lympics" and "Captain Caveman and the Teen Angels". In addition to eight new episodes of "Scooby-Doo" and reruns of the 1969 show, Scooby-Doo also appeared during the "All-Star" block's "Laff-a-Lympics" series, which featured 45 Hanna-Barbera characters competing in "Battle of the Network Stars"-esque parodies of Olympic sporting events. Scooby was seen as the team captain of the "Laff-a-Lympics" "Scooby Doobies" team, which also featured Shaggy and Scooby-Dum