1) “Big Brother” finale, 9-11 p.m., CBS. The last remnants of summer TV are finally fading; after tonight, only “Bachelor in Paradise” will linger on the big networks. “Big Brother” started with 16 people and is now down to three – Xavier Prather, 27, a lawyer; Derek Frazier, 29, a safety officer; and Azah Awasum (shown here), 30, a sales diector. Tonight, one of them gets $750,000.
2) “Nova: “The Cannabis Question,” 9 p.m., PBS. Marijuana legalization has soared faster than science’s ability to test it. Now “Nova” offers a balanced view. The good: Pot sometimes provides great help dealing with epilepsy, PTSD and sleep disorder: The bad: Heavy-using teens show cognitive problems; use during pregnancy has doubled, with the impact unclear. Also, pot has a nine-percent addiction rate – less than alcohol and tobacco, but still a problem.
3) “Riverdale,” 8 p.m., CW. We can’t blame Alice for rejecting reality. Her ex-husband, a serial killer, is dead; so is one of her daughters, Polly, a former cult member. The other daughter, Betty, is a fine person, but in perpetual peril. Now Alice drifts into a musical fantasy, complete with happy family.
4) “The Conners,” 9 p.m., ABC. After some good guest spots on “Young Sheldon” (as a drama teacher and real-estate salesman), Jason Alexander begins a two-episode ride here. He’s Pastor Phil, who leads the Alcoholics Anonymous meetings Becky attends … and who now counsels her troubled sister Darlene. Also guesting: Patton Oswalt as the new city councilman, complicating Jackie’s restaurant.
5) “Rhodes to the Top” debut, 10 p.m., TNT. In the sweaty world of wrestling, Cody and Brandi Rhodes offer fresh faces. He’s a second-generation star, given to dapper clothes and near-platinum hair; she’s the first Black woman to run a wrestling group. Now – right after their “All Elite Wrestling” (8-10 p.m.) — here’s a likable reality show, as their baby nears.