Directed by Matt Vogel | Starring: Audra McDonald, Zosia Mamet, Jim Gaffigan, Eric Jacobson

This holiday special goes back in time to show how Elmo's ancestors--not to mention those of Grover, Big Bird, Bert, Ernie, Oscar the Grouch and Cookie Monster--helped transform "the most unfriendly street in town" into the bright, kind, music-filled place it is today.

IMDb Once Upon a Sesame S... movie posters