Scrappy has a contradicted origin. Originally as shown in the introduction of the series episodes, Scrappy only met his Uncle Scooby after becoming a young pup. But the December 1980 episode of Scooby-Doo and Scrappy-Doo ("Scrappy's Birthday") depicts Scrappy-Doo's birth with both Scooby and Shaggy in attendance. Born at St. Bernard's Hospital to Scooby-Doo's sister Ruby-Doo on December 20, 1980, Scrappy idolizes his uncle Scooby and would often assist Scooby and his friends in solving mysteries (Scrappy saves Scooby several times from monsters when they were looking for the rest of the gang). With a highly energetic and brave personality, despite his small size, Scrappy was the exact opposite of his uncle; Scrappy would usually insist on trying to directly fight the various monsters Scooby and his associates encountered and generally have to be dragged away by Scooby. Related to this, one of Scrappy's catchphrases was, "Lemme at 'em! Lemme at 'em! I'll splat 'em! I'll rock 'em and 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.