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.

Elmo loves his fuzzy, blue blanket, and would never let anything happen to it. However, a tug-of-war with his friend Zoe sends his blanket to a faraway land, and Elmo in hot pursuit. Facing life without his cherished blanket, Elmo musters all of his determination and courage and heads off on an action-packed rescue mission that plunges him into Grouchland-a place full of grouchy creatures, stinky garbage and the villainous Huxley. Along the way, Elmo learns an important lesson about sharing, realizing that he was selfish with his friend and responsible for what happened.

A documentary about Caroll Spinney who has been Sesame Street’s Big Bird and Oscar the Grouch since 1969. At 78-years-old, he has no intention of stopping.