Scrappy-Doo sock 'em!" Another of Scrappy-Doo's catchphrases is, "Ta dadada ta daaa! Puppy power!". He is also quite strong, capable of smashing down solid rock walls and carrying both Scooby and Shaggy over his head seemingly without effort. The character was created by Joseph Barbera and developed by writer Mark Evanier, who has acknowledged that Scrappy's personality was largely based on that of the "Looney Tunes" character Henery Hawk. In "Scooby-Doo Meets the Boo Brothers", "Scooby-Doo and the Ghoul School", and "Scooby-Doo and the Reluctant Werewolf", Scrappy is more toned down, as he is less feisty and a little more cowardly,
Scooby-Doo joined with a new Hanna-Barbera show, "Dynomutt, Dog Wonder", to create "The Scooby-Doo/Dynomutt Hour" (the show became "The Scooby-Doo/Dynomutt Show" when a bonus "Scooby-Doo, Where Are You!" rerun was added to the package in November 1976). Joe Ruby and Ken Spears, now working for Silverman as supervisors of the ABC Saturday morning programs, returned the program to its original "Scooby-Doo, Where are You!" format, with the addition of Scooby's dim-witted country cousin Scooby-Dum, voiced by Daws Butler, as a recurring character. The voice cast was held over from "The New Scooby-Doo Movies" save for Nicole Jaffe, who retired from acting