1) “Station 19” and “Big Sky” season-finales, 8 and 10 p.m., ABC. Next week, “Grey’s Anatomy” wraps its season with its 399th and 400th episodes. First, ABC clears out the other Thursday shows: On “Station 19,” Andy is on trial for manslaughter, after foiling a rape attempt; now she finds a key witness. On “Big Sky,” Jenny (shown here in a previous episode) rushes to find Travis; Cassie, after a surprise, changes her quest forever. And after meeting both, the new sheriff may stick around.
2) “Welcome to Flatch,” 9 and 9:30 p.m., Fox. The good news is that this oft-funny show was renewed for a second season. (That’s a surprise, because it’s 23rd out of 24 Fox series in the Nielsen ratings.) And the bad is that tonight’s first episode is only so-so. Shrub finds a job he’s good at … his cousin Kelly has a TV moment … and, of course, things crumble. Father Joe’s story is lame, but Cheryl has a fairly good one. Maybe the second episode, with a séance and a backwoods adventure, will be better.
3) “Young Sheldon” season-finale, 8 p.m., CBS. The lives of George and Mary Cooper – middle-income, God-fearing Texans – has crumbled lately. Their 17-year-old son lied about his age; now his girlfriend, 29, is pregnant, his mom has been suspended from her church job and both parents are looking for new work. Also, young Georgie and his grandmother have a casino in the back of her laundromat; now they try a business trip across the border.
4) “United States of Al;” season-finale, 8:30, CBS. By pumping up their storylines, one likable comedy (“Young Sheldon”) has become even better and this one has deteriorated. Diligent Al throwing everything away for lust? Good-guy Riley having an affair with his ex-wife Vanessa? It has all seemed contrived; now a guilt-ridden Riley confesses to Vanessa’s fiance.
5) “Law & Order” shows’ season-finales, 8-11 p.m., NBC. The night begins with a crossover: On “Law & Order,” an off-duty police detective is killed, stirring intense reactions; Benson is asked to help. Her show, “Law & Order: Special Victims Unit,” is at 9 p.m., followed by “Law & Order: Organized Crime” at 10.