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! The Mystery Begins first seen on the DVD of "Scooby-Doo! and the Samurai Sword", "17 Again" and "Shorts". "Scooby-Doo! The Mystery Begins" was the most-watched telecast in Cartoon Network history with 6.1 million viewers on September 13, 2009, outdistancing the previous high of 3.9 million viewers that tuned into the premiere of the animated series "". Due to the success of "Scooby-Doo! The Mystery Begins", a sequel went into development in October 2009. Titled "Scooby-Doo! Curse of the Lake Monster", principal photography commenced on March 15, 2010 in various locations around Southern California. The sequel aired on October 16, 2010 and was released