Scooby-Doo and Scrappy-Doo (1979 TV series) threatening cancellation for the show, whose ratings were in decline. ABC was going to choose between two shows-Scooby-Doo or an unnamed pilot from Ruby Spears Enterprises. Therefore, for its 1979–1980 season, "Scooby-Doo" was given a major overhaul, adding the character of Scooby's nephew Scrappy-Doo, voiced by Lennie Weinrib, and changing the name of the show to "Scooby-Doo and Scrappy-Doo". Although still present in these episodes, the characters of Fred, Daphne, and Velma became less essential to the plot and Shaggy, Scooby and Scrappy were the main focus. Marla Frumkin took over Pat Stevens' role as Velma Dinkley towards the end
Scooby-Doo, Where Are You! Roberts, and were performed by Roberts, who also made a new recording of the "Scooby Doo, Where Are You!" theme song for the second season. The series' theme song has been covered by several subsequent artists, including Matthew Sweet for the 1995 TV special and album ""; Third Eye Blind for the 1998 film "Scooby-Doo on Zombie Island"; Billy Ray Cyrus for "Scooby-Doo! and the Witch's Ghost" (1999); Jennifer Love Hewitt for "Scooby-Doo and the Alien Invaders" (2000); the B-52's (Cindy, Kate and Fred) for "Scooby-Doo and the Cyber Chase" (2001); MxPx for the live-action "Scooby-Doo" film (2002); and Krystal