1) “Saturday Night Live,” 11:29 pm., NBC. Billie Eilish (shown here) becomes the first person this season to double as host and music guest. She’s also the first to do it since Nick Jonas in February; since then, three people who had previously hosted – Miley Cyrus, Taylor Swift and Halsey – settled for being music guest. Eilish also may be the youngest person to do both; she’ll be a teen until next Saturday. When she was 17, she became the second person ever (after Christopher Cross) to sweep the top four Grammys.
2) “How the Grinch Stole Christmas,” 8 p.m., TBS. On three straight Saturdays, we can savor one of TV’s greatest shows. “Grinch” is on TBS tonight (rerunning at 8:30, with the delightful “A Christmas Story” at 9) … on TNT next week … and then on NBC on Christmas night. Catch it often.
3) “Rudolph the Red Nosed Reindeer” and “Frosty the Snowman,” 8 and 9 p.m., CBS. Here are two more classics that shuttle between broadcast and cable. Freeform plans to rerun then on Dec. 19, 20, 24 and 25. The difference is that CBS also airs the sub-par “Frosty Returns”; tonight, it’s at 9:30.
4) “Hot Mess Holiday,” 7 and 9 p.m., Comedy Central. After debuting the terrific “Clusterfunke Christmas” last Saturday, Comedy Central has another film that tries hard to be different. This one starts poorly, gets heavy-handed and sometimes injects very-adult dialogue. Still, it has a neatly offbeat feel, as young women juggle Indian traditions and Chicago night life. There are fun little moments with Kal Penn and Tituss Burgess; and after a balky start the plot is quite clever.
5) “The Waltons’ Homecoming,” 8-10 p.m., CW. If you missed this splendid film two weeks ago, catch it now. Fifty years after the original “Homecoming,” it beautifully retells the story (based on writer Earl Hamner’s boyhood) of a 1933 Christmas. Other top movies include a “Toy Story” marathon on Freeform (3:10, 5:10, 7:15, 9:45 p.m.) and a Bill Murray marathon on AMC, with “Ghostbusters” films (1 and 3:30 p.m., 10 p.m. and 12:30 a.m.) surrounding “Caddyshack” and “Scrooged,” at 6 and 8 p.m.