1) “58 Hours: The Baby Jessica Story” and “Super Reviewers: Rate, Review, Repeat,” 9 and 9:30 p.m., CNN. On two Saturdays, CNN is debuting four half-hour documentaries. The first re-tells a compelling story – heroes (shown here) struggling to save an 18-month-old toddler who fell into a narrow well in her aunt’s backyard. The second is fresh and current – meeting people who write lInternet reviews. There’s a contagious joy to Denise Barclay, who roams the country in her RV, doing quick reviews for Google Maps.
2) Olympics. Now track-and-field is part of the busy mix. Peacock has live coverage of seven track events, including three finals, from 6-11 a.m. ET; NBC will rerun some of them at night (8-11:30 p.m. ET). NBC has much more, including reruns of U.S. teams in women’s volleyball (2 p.m., Taiwan) and men’s basketball (4 p.m., Czech Republic). At night, it also includes live coverage of five swimming finals plus women’s beach volleyball.
3) “Eden: Untamed Planet,” 8 p.m., BBC America. The Namib Desert isn’t our usual vision of Eden. Temperatures can leap from 50 at night to 120 in the day; an average year has one-quarter inch of rain. But some surprising animals survive (about 150 lions, sometimes going a week between meals) or thrive: There are tens of thousands of ostriches, towering eight feet high (with eyes literally bigger than their brains), plus giraffes even higher; they know the tricks to finding food and moisture.
4) “Magnum P.I.,” 8 p.m., CBS. At first, Magnum suspects some neighborhood-watch people are simply overzealous, hiring him to probe a shady character. Then he finds they might have found a serial killer. Also in this rerun, Jin’s money-laundering business leads him to wanting to help a new friend.
5) Movies. It’s a great night for opposite audiences. Families can savor Freeform, with animated gem – “Wreck-It Ralph”(2012) at 1:50 p.m., its sequel (2018) at 3:55 and “Frozen” (2013) at 6:30 – followed by the gorgeous “Cinderella” (2015) at 9. But some grown-ups will like the lyrical beauty of director Sergio Leone and composer Ennio Morricone, in the rugged Clint Eastwood westerns “Fistful of Dollars” (1964) and “For a Few Dollars More” (1965), at 8 and 10 p.m. o Turner Classic Movies.