1) “SNL 50,” 8-11 p.m. ET Sunday, NBC. “Saturday Night Live” arrived on Oct. 11, 1975, promptly changing TV. Now comes the 50th-season reunion. It includes past hosts and music guests — Steve Martin, Tom Hanks, Scarlett Johansson (shown here), Quinta Brunson, Kim Kardashian, Dave Chappelle, Paul Simon, Paul McCartney, John Mulaney, Robert De Niro and more.
2) “Miss Scarlet” season-finale, 8 p.m. Sunday, PBS. All season, Eliza has debated Inspector Blake, who distrusts private detectives. Now one of his men has been attacked; Eliza and Blake scramble to learn why. It’s a fairly good mystery that ends with a splendid moment. Then “All Creatures Great and Small” has a neat detour in the brothers’ relationship.
3) “Rescue HI-Surf,” 9 p.m. today, Fox. It’s time for Fox’s post-Super Bowl makeover. That starts with the debut of “Extracted,” a survival reality show, at 8 p.m. today. Then comes what Fox calls the most dangerous “HI-Surf” rescue yet. It involves the discovery of live torpedoes and does have some high-stakes moments, surrounded by so-so ones.
4) “The Voice,” 8-10 p.m. today, NBC. The second week of auditions should be fun … but be sure to change the channel afterward: “The Hunting Party” (10 p.m.) is awful. The show’s opener (which aired three times) was dismal; this one is even nastier. Also, the final minutes of the case are near-copies of the first episode. And at a key time, cops forget to cover the exits.
5) “High Potential” season-finale, 9 p.m. Tuesday, ABC. This clever show wraps its 13-episode season as kidnappings point to a maze of clues from puzzles and board games. That leads into a “The Rookie” episode that’s set on Valentine’s Day. Next week, “Rookie” moves to 9 p.m.; “High Potential” slides to 10 for reruns and will be back next season.
6) “Chautauqua at 150: Wynton Marsalis’ ‘All Rise,’” 10 p.m. Tuesday, PBS. Ostensibly, this is about a new production of Marsalis’ symphony last summer, as the Chautauqua Institution turned 150. Actually, it has only a few minutes of the piece, mostly at the end, alongside lots of talk. The music is magnificent; the talk ranges from interesting to terribly repetitious.
7) “The Masked Singer” opener, 8 p.m. Wednesday, Fox. The post-football shake-up continues, via reality shows. On this one, masked singers perform “SexyBack,” “La Bamba,” “Mad World” and such. That’s followed at 9 by Rob Lowe’s “The Floor,” a quiz show that opened its season after the Super Bowl. And at 8 p.m. Thursday is the “Next Level Chef” opener.
8) “Elsbeth,” 10 p.m. Thursday, CBS. Ever since “Rear Window,” mysteries have savored the idea of a distant witness. Now the distance is thousands of miles. Through an art installation, a Scottish singer (Ioann Gruffudd, who’s been Lancelot, Horatio Hornblower and more) sees a Manhattan crime. It’s a fun story, with some twists appropriate for Valentine eve.
9) “SNL 50: The Homecoming Concert,” 8 p.m. ET Friday, Peacock. There’s a big build-up to Sunday’s reunion. On Saturday, NBC airs a Peacock documentary on “Saturday Night Live” music at 8 p.m. and reruns the show’s first episode at 11:30. In Sunday, it has a red-carpet preview at 7 p.m. ET. First, however, Peacock has this mega-concert, with music by Lady Gaga, Eddie Vedder, Bonnie Raitt, Post Malone, Miley Cyrus, Jelly Roll, Bad Bunny, Brittany Howard and more.
10) “The White Lotus” season-opener, 9 p.m. Sunday, HBO. On recent Sundays, football and the Grammys have dominated and other shows have waited. Now comes a fresh surge on premium cable (“Yellowjackets,” 8 p.m., Showtime, then “White Lotus”), CBS (“Tracker,” “Watson” and “Equalizer”) and Fox (new cartoon line-up, with “Family Guy” at 8).