Little Bill is an American animated children's television series produced for Nick Jr. The stories are based on Bill Cosby's Little Bill book series, set in Philadelphia, and feature Bill Jr. learning a lesson or moral. It was developed through research and in consultation with a panel of educational consultants. Little Bill was seen through until September 9, 2006, when the block was replaced with the KOL Secret Slumber Party block (which became: Cookie Jar TV). Sonia Manzano, best known for playing Maria Rodriguez on Sesame Street, was a frequent writer for the show.