1) “B Positive” debut, 8:30 p.m. Thursday, CBS. The first new, scripted show of the season is a delight, with great characters and sharp humor. Thomas Middleditch (the former “Silicon Valley” star) is great as a divorced dad who needs a kidney donor. But the real joy is Annaleigh Ashford (shown here with Middleditch) as Gina, a former high school classmate with a kidney to spare. A Broadway veteran (and Tony-winner), Ashford skillfully makes Gina seem caring and clueless, helpful to strangers and unable to help herself.
2) “Young Sheldon,” 8 p.m., CBS. It’s a pivotal time for everyone: Sheldon is graduating from high school, his twin sister graduates from elementary school and their brother was fired (after a customer stole the cash) by Dale, who’s forlorn about his break-up with their grandmother. All of that is tied together in an episode that’s both funny and warm. There are nice surprises in Sheldon’s valedictorian speech … and in the brief narration at the end.
3) “The Bachelorette,” 8-10:01 p.m., ABC. Rumors say Clare Crawley throws the show off-course; she makes her decision early and exits … forcing “Bachelor” to bring in another woman to date the 15 guys left. ABC hints that this episode (transplanted from Tuesday) is when it happens. Crawley – a hairstylist, 39 – makes her move with Dale Moss, 32, who is a former football receiver on four NFL practice squads and (briefly) in the Arena League.
4) “Supernatural,” 8 p.m., CW. We’re just two weeks from the end of a series that has lasted 15 years, shaking Heaven and Earth (fictionally) in the process. Now the brothers (Sam and Dean) have their plan in motion; with Jack and Castiel, they try to save the world.
5) ALSO: A good show, “Superstore,” has a surprisingly poor episode at 8 p.m. on NBC. It’s the final episode for America Ferrera, who plays Amy, and the show wants to set up what’s ahead. It should have found a way to do that quickly and painlessly; instead, it drags out a bleak half-hour. That’s followed by “Connecting” at 8:30 and then, switching to CBS, more comedies: At 9, “Mom” opens its first season without Christy; Anna Faris, who plays her, has left. At 9:30 is a “Young Sheldon” rerun.