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"O C'mon All Ye Faithful" is the double length first Disney+ exclusive episode of The Simpsons and the seven hundred seventy-eighth and seven hundred seventy-ninth episode overall. It was released on Disney+ on December 17, 2024. The episode was written by Carolyn Omine and directed by Debbie Bruce Mahan and Matthew Faughnan. It guest stars Derren Brown as himself, Patti LaBelle as herself, and Pentatonix as the "World Famous Santa Claus" and "Local Springfield Santa Claus" singers.

Famed British mentalist, Derren Brown, comes to Springfield and uses psychological tricks and showmanship to raise the town's Christmas spirit. When Homer gets hypnotized and mistakenly believes he is Santa Claus, it sets off a cheery chain reaction and causes everyone to question what they believe and to explore the meaning of "miracle".

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