The firm was founded in 1977 by veteran writers Joe Ruby and Ken Spears. Both men started out as sound editors at Hanna-Barbera and later branched out into writing stories for such programs as Space Ghost and The Herculoids. In 1968, they created Scooby-Doo, Where Are You! for Hanna-Barbera. They were also writers and producers for DePatie-Freleng Enterprises.
The firm's credits include the animated series Fangface, The Plastic Man Comedy/Adventure Show, Dink, the Little Dinosaur, Thundarr the Barbarian, Rickety Rocket, and other animated series such as Mr. T, Rubik, the Amazing Cube, Saturday Supercade, Turbo Teen, the 1983-1987 version of Alvin and the Chipmunks, The Centurions series, the new Looney Tunes series and movies, the 1988 Superman series, and the American Mega Man cartoon series. Ruby-Spears was also responsible for the animated sequence in the movie Child's Play.