 By the late 1960s , Hanna @-@ Barbera Productions was the most successful television animation studio in the business . The Hanna @-@ Barbera studio produced over 3000 animated half @-@ hour television shows . Among the more than 100 cartoon series they produced were The Quick Draw McGraw Show , Top Cat , Jonny Quest , The Magilla Gorilla Show , The Atom Ant / Secret Squirrel Show , Scooby @-@ Doo , Super Friends , and The Smurfs . The company also produced animated specials based on Alice in Wonderland , Jack and the Beanstalk , and Cyrano de Bergerac , as well as the feature @-@ length films Charlotte 's Web and Heidi 's Song . 
