Friday, December 18, 2015 ratings — New episodes: Dateline NBC, Masterchef Junior, World’s Funniest, and 20/20. Special: A Home for the Holidays, Caught on Camera With Nick Cannon, Frosty the Snowman, Frosty Returns, Grandma Got Run Over By A Reindeer, and Penn & Teller: Fool Us.  Rerun: Last Man Standing, Dr. Ken, Blue Bloods, and Shark Tank.

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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?