1) “Roswell, New Mexico” season-opener, 8 p.m., CW, rerunning Thursday. Sure, this might seem like a silly, sci-fi soap opera. We follow pretty people (three of them descended from outer-space aliens) and a couple others resurrected from the dead. But this is from Amblin, the Steven Spielberg company that made “Resident Alien” a gem; it’s well-cast and sharply filmed. Tonight, the three sorta-siblings eye an eerie lookalike. And in Los Angeles, Liz (shown here), a brilliant scientist, nears a breakthrough and a crisis.
2) Olympics. Gymnastics has a sort of inverted plan: A team championship first, then individual ones. So the men’s teams compete today, with the women Tuesday. That’s live on Peacock, from 6-11 a.m. ET, but it will seem live when NBC shows the finals, from 8-9:30 p.m. This afternoon (noon to 5 p.m.), NBC has swimming and lots of women’s sports – beach volleyball, water polo, 3-on-3 basketball. Later (9:30-11 p.m.), it has more swimming. There’s much more on cable and on www.nbcolympics.com.
3) “The Bachelorette,” 8-10 p.m., ABC. Next week, we have the home-town visits. Katie Thurston will visit Blake Moynes, a Canadian wildlife manager; Michael Alio, an Akron business-owner; and twos ales guys, Greg Grippo and Justin Glaze. First, however, it’s the “men tell all” episode. The rejected suitors talk about her and each other; also, one has a heart-to-heart talk with her.
4) “Housebroken,” 9:01 p.m., Fox. Here’s a rerun of the witty season-opener. Honey (Lisa Kudrow), a wise poodle, conducts group therapy sessions for the other pets. That follows a rerun of the 300th “Hell’s Kitchen” episode, with the teams trying their first dinner service.
5) “United States of Al,” 9:30 p.m., CBS. Preparing to celebrate her 11th birthday, Hazel is stunned to find that Al, who’s from Afghanistan, doesn’t even know when his birthday is. She decides to share the party, in an episode that reflects this show’s quiet blend of warmth and humor.