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.
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Once Upon a Sesame Street Christmas is a one-hour Sesame Street Christmas special that first aired on HBO on November 25, 2016, and on November 22, 2017, on PBS. It was the franchise's first Christmas special in ten years.
