Llewellyn Sinclair

Llewellyn Sinclair, the musical director of O! Streetcar! and is voiced by Jon Lovitz. He first appeared in the episode "A Streetcar Named Marge". His sister, Ms. Sinclair, runs the Ayn Rand School for Tots.

Llewellyn is depicted as short-tempered and a perfectionist. Originally, Marge is turned down for the part of Blanche, but after seeing how sad she really is, he realizes she's perfect. He insinuates that he once reduced a class of fourth graders to tears but got a decent review. In the musical, he plays Pablo, which was originally played by Otto but Otto "didn't work out". In the end, the musical is a success, which Llewelyn takes all the credit for. Llewellyn has since made two appearances. He appeared briefly in "Sweets and Sour Marge" as one of the townspeople in the pyramid and again in "The Ziff Who Came to Dinner" along with several other Lovitz voiced characters.