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. NBC has a new “SNL” Saturday and a red-carpet preview at 7 p.m. ET Sunday. Peacock has two documentaries and adds this concert with 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 paycable (“Yellowjackets,” 8 p.m., Showtime, then “White Lotus”), CBS (“Tracker,” “Watson” and “Equalizer”) and Fox (new cartoon line-up, with “Family Guy” at 8).