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 created on-screen by computer-generated special effects. "Scooby-Doo" was a financially successful release, with a domestic box office gross of over US$130 million. A sequel, "", followed in March 2004 with the same cast and director. "Scooby-Doo 2" earned US$84 (€55,98) million at the U.S. box office. A third film was planned, but later scrapped following Warner Bros.' disappointment at the returns from "Scooby-Doo 2". As of 2013, Warner Bros. Pictures was developing a fully animated Scooby-Doo feature film with Atlas Entertainment. Charles Roven and Richard Suckle, who produced the first two live-action films, were producing the animated film, and Matt