Scooby-Doo the series and the billing, in an attempt to boost "Scooby-Doo"s slipping ratings. The 1979–80 episodes, aired under the new title "Scooby-Doo and Scrappy-Doo" as an independent half-hour show, succeeded in regenerating interest in the show. Lennie Weinrib voiced Scrappy in the 1979–80 episodes, with Don Messick assuming the role thereafter. Marla Frumkin replaced Pat Stevens as the voice of Velma mid-season. As a result of "Scooby-Doo and Scrappy-Doo's" success, the entire show was overhauled in 1980 to focus more upon Scrappy-Doo. At this time, Scooby-Doo started to walk and run anthropomorphically on two feet more often, rather than on
Scooby-Doo, Where Are You! plans to create a non-violent Saturday morning program that would appease the parent watch groups that had protested the superhero-based programs of the mid-1960s. Originally titled "Mysteries Five", and later "Who's S-S-Scared?", "Scooby Doo, Where Are You!" underwent a number of changes from script to screen (the most significant being the downplaying of the musical group angle borrowed from "The Archie Show"). However, the basic concept—four teenagers (Fred, Daphne, Velma, and Shaggy) and a cowardly, clumsy Great Dane (Scooby-Doo) solving supernatural-related mysteries—was always in place. "Scooby-Doo" creators Joe Ruby and Ken Spears served as the story supervisors on the series.