1) “How to Get Away With Murder” series finale, 10 p.m., ABC. For six seasons, this show has delivered tangled mysteries, spiced by spectacular performances from Viola Davis (shown here with Tom Verica) as Annalise. She already has an Emmy and three more nominations; now come pivotal moments. On trial for murder, she learns there’s a surprise witness. Then there’s the pesky mattert of a flashforward that showed Annalise’s funeral. ABC promises we’ll learn what that’s all about and who (if anyone) killed her.
2) “Katy Keene” season-finale, 8 p.m., CW. For Katy (the ever-likable Lucy Hale), big things keep happening. But to make her plan work, she needs help from her oft-unlikable boss Gloria. Also, Jorge plans a rally to stop the sale of his parents’ building … but doesn’t realize whom he’s fighting.
3) “In the Dark,” 9 p.m., CW. There are way too many all-knowing heroes on TV and in the movies; now it’s refreshing to see the opposite: An impossible mission – in a police impoundment lot, no less – must be pulled off by Murphy (who’s blind) and Fritz (who’s nervous, fragile and often incompetent). The result has zero credibility, but is surprisingly entertaining.
4) “Station 19” season-finale, 9 p.m., ABC. The medical world of “Grey’s Anatomy” (which ended its season early) again entwines with the rescue world of “Station 19.” Now Sullivan undergoes surgery for his chronic leg pain; also, an attempt to evacuate a doctor from another hospital (Pac North) puts the crew in danger. Meanwhile, Andy pursues her suspicions about her mother’s death.
5) “Mom,” 9 p.m., CBS. A Christmas episode now? That sort of thing happens this year, when many of the shows had to end production early. “Mom” (which settled for 20 episodes instead of 22) finds Bonnie in the new position of being an Alcoholics Anonymous sponsor for Patty (Kate Micucci). Alas, Christy is soon telling stories about their wretched Christmases past.