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 among its members. "Scooby's All-Star Laff-a-Lympics" was retitled "Scooby's All Stars" for the 1978–79 season, reduced to 90 minutes when "Dynomutt" was spun off into its own half-hour and the 1969 reruns were dropped. "Scooby's All-Stars" continued broadcasting reruns of "Scooby-Doo" from 1976 and 1977, while new episodes of "Scooby-Doo" aired during a separate half-hour under the "Scooby-Doo, Where are You!" banner. After nine weeks, the separate "Where are You!" broadcast was cancelled, and the remainder of the 16 new 1978 episodes debuted during the "Scooby's All-Stars" block. The 40 total "Scooby-Doo" episodes produced from 1976 to 1978 were later