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 Ricky Gervais, Kenan Thompson and Chris Paul. The series will also include fictional guest stars, including Jaleel White as Steve Urkel, Kevin Conroy as Batman, Wonder Woman, The Flash and Sherlock Holmes. Beginning in 2012, Warner Bros. Animation began producing direct-to-video special episodes in the style of the concurrently produced films for inclusion on "Scooby-Doo" compilation DVD sets otherwise including episodes from previous Scooby series. These include "Scooby-Doo! Spooky Games", included on the July 2012 release "Scooby-Doo! Laff-A-Lympics: Spooky Games", "Scooby-Doo! Haunted Holidays", from the October 2012 release "Scooby-Doo! 13 Spooky Tales: Holiday Chills and Thrills", and "Scooby-Doo! and the