Hitting the high notes

You don’t have to be well versed in opera to be swept away by “Birgit Nilsson: A League of Her Own,” a tribute to the Swedish soprano best known for her fearless performances in works by Richard Wagner and Richard Strauss. Interviews with the late legend and her admirers reveal backstage stories that deserve their own librettos.

8 p.m. Friday, TPT, Ch. 2

Against all odds

The four-part docuseries “Action” is tied to the recent legalization of sports gambling. But it’s most fascinating when reminding viewers that the odds are always in favor of the prognosticators who turned charging suckers for their professional guesses into a sure bet. Director Luke Korem’s footage of losers in casino sportsbooks is as depressing as watching drunks at last call.

7 p.m. Sunday, Showtime

A prince of a man

“Prince Charles at 70” opens with the future king collecting eggs, the first of many “commoner” acts filmed to show that His Royal Highness is just like one of us. It’s a fairly jovial — and convincing — sales job, though the filmmakers let slip that their beloved subject matter hasn’t quite mastered the art of shopping for souvenirs.

7 p.m. Sunday, TPT, Ch. 2

Don’t go away mad

Motley Crue has vowed that it will never tour again — which means you can probably expect to see them at a venue near you by summer 2020. In the meantime, there’s “The Dirt,” a biopic of the glam-metal band with Machine Gun Kelly playing Tommy Lee and Pete Davidson as a record executive. The band recorded new songs for the movie.

Now streaming on Netflix

Neal Justin