Sesame Street is the popular long-running children's series starring puppet characters such as Elmo, Bert, Ernie, Oscar The Grouch, Grover, and many others.
A photo from Episode 4508
Lucas and Kirk are parodies of Bert and Ernie, two very popular characters from the show. Brownie Monster is a parody to the character Cookie Monster, another popular character of the show and Fred The Postman is a parody and relative of Grover. Rufus appeared in a episode segment on the show with his puppeteer, Sam.