"The Sing-Off" 8 p.m. NBC — Judges pick songs for the final four.  

"The X Factor" 8 p.m. Fox (third season finale) — Given the anemic ratings, very few folks paid attention to this reality show this season.

"Charlie Brown Christmas" 8 p.m. ABC — Pensive and thoughtful, Snoopy & Co. ponder the meaning of Christmas.

"20/20" 9 p.m. ABC — Robin Roberts anchors a retrospective on the biggest stories of the year, from the Boston Marathon bombing to George Zimmerman to the election of Pope Francis.

"Project Runway All Stars" 9 p.m. Lifetime — Christian Siriano and Nina Garcia guest judge.

"Ground Floor" 10 p.m. TBS — John McEnroe guests as a fuming client.

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Collect candy, play carnival games for prizes and do more not-so-scary stuff at Boo at the Zoo at Zoo Atlanta on Saturday and Sunday. (Courtesy of Zoo Atlanta)

Credit: Photo courtesy of Zoo Atlanta

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Corbin Spencer, right, field director of New Georgia Project and volunteer Rodney King, left, help Rueke Uyunwa register to vote. The influential group is shutting down after more than a decade. (Hyosub Shin/AJC 2017)

Credit: Hyosub Shin