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 Spooky Scarecrow" and "Scooby-Doo! Mecha Mutt Menace", from the September 2013 DVD releases "Scooby-Doo! 13 Spooky Tales: Run for Your 'Rife!" and "Scooby-Doo! 13 Spooky Tales: Ruh-Roh Robot!". On May 13, 2014, another episode, "Scooby-Doo! Ghastly Goals" was released on the "Scooby-Doo! 13 Spooky Tales: Field of Screams" DVD. On May 5, 2015, "Scooby-Doo! and the Beach Beastie", the sixth direct-to-video special, was released on the "Scooby-Doo! 13 Spooky Tales: Surf's Up Scooby-Doo" DVD. Gold Key Comics began publication of "Scooby-Doo, Where Are You!" comic books in December 1969. The comics initially contained adaptations of episodes of the television show