1) “Mom” series finale, 9 p.m.,, CBS. One of the decade’s best comedies ends with a cascade of plot twists – some grim, some joyous, some just silly. One dandy scene has Bonnie (Allison Janney, furthest right of the women shown here) navigate the plot twists by phone, alternately putting different people on hold. Another has an Alcoholics Anonymous newcomer learn that these now-cheery women can match any of her nightmares. All of this is both hilarious and warm, twin moods that Janney handles deftly.
2) Season-finales, 8 and 9:30 p.m., CBS. “Young Sheldon” ends its fourth season with an emotional crisis: At 11, Missy has had her first heartbreak; the impact resonates throughout her family. Then “B Positive” ends its first season with Gina and Drew preparing for the transplant; she also looks for a place she can live post-transplant. “Young Sheldon” has been renewed for next season, but “B Positive” is pending; so is “United State of Al” (8:30), which has six episodes after tonight.
3) “Grey’s Anatomy,” 8-10 p.m., ABC. There are still three more episodes for this season, but first “Anatomy” jumps back 16 years, to the terrific two-parter that first propelled it to the top. That was in its second season, with an hour that followed the Super Bowl and continued the next day. Meredith fears this will be a bad day, then is right, complete with a bomb; Kyle Chandler is a guest star.
4) “Last Man Standing,” 9 p.m., Fox. Next week, a two-episode series-finale ends a run that has spanned nine seasons, 10 years and two networks. Tonight, Mandy is jealous during a marketing retreat, because her dad (Tim Allen) spends more time with her sister’s husband Ryan than with her. Also, Ed tries to get Joe (Jay Leno) and Chuck to see a musical.
5) “Everything’s Gonna Be Okay,” 10 p.m., Freeform. A terrific character gets the focus tonight. Matilda is 18, brilliant and autistic, a gifted (and unemployed) musician; she’s perfectly played by Kayla Cromer, who’s also on the autism spectrum. Tonight – after four minutes of fun and pointless dialog – she presents her mega-plan. It’s the sort of thing that renders her elders – her half-brother (Josh Thomas, the show’s creator) and her girlfriend’s dad (Richard Kind) helpless, but in a funny way.