(Photo by: Darren Michaels/Sony/NBC)

Thursday, December 20, 2018 ratings — New episodes: Timeless, Murphy Brown, and The Great American Baking Show. Specials: A Charlie Brown Christmas, Howie Mandel Stand-Up Extravaganza, A Christmas Story Live!, and Deal or No Deal. Reruns: The Big Bang Theory, Young Sheldon, and SWAT.

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These are the fast affiliate ratings. The percentages represent the change since the previous original episode. (Percentages aren’t given for reruns or specials.) To see past ratings for a particular show, click the show’s link. The show pages are updated with the daily final ratings when they become available. Those pages include season averages to date.

What were you watching last night? Original network programming, reruns, cable, or something else?