‘Borrowers’ must care for elderly in finale

Tonight’s might-see

“Baby Borrowers,” conclusion, 9 p.m., NBC. Last week’s episode (rerunning at 8 p.m.) had the teens become temporary parents of other teens.

Now the final twist has them care for the elderly, with varying disabilities. A follow-up tells what happened to the couples when the experiment ended.

Tonight’s must-see

“Jaws” (1975), 8 p.m., AMC or Shark Week specials, 7 p.m.-3 a.m., Discovery Channel.

It was “Jaws” that launched our national obsession with sharks. A young director (Steven Spielberg) and a veteran composer (John Williams) created vivid images.

And it is Discovery that propels the obsession each year.

Tonight’s films have “Prowling Sharks in the Mediterranean” at 7 p.m., “Jaws of the Pacific” at 8, a “Mythbusters” special at 9 and “American Shark” at 11. Then “Jaws of the Pacific” and “Mythbusters” rerun.

Other choices include

PBS’ “Click & Clack’s As the Wrench Turns,” 7 p.m., KSPS. This cartoon for grown-ups has the brothers facing a crisis: A new garage has opened, featuring good-looking mechanics and a cappuccino bar.

PBS’ “Nova ScienceNow,” 9 p.m., KSPS, KUID. In 1962, scientists were impressed by the Nebraska discovery of mammoths – their 12-foot tusks locked together. They apparently became stuck during a fight. This film uses modern science to learn more.

“So You Think You Can Dance,” 9 p.m., Fox. Last week’s results show was rough, with the terrific Will and Twitch in the bottom. One was ousted. That hour – with performances by L.L. Cool J and the Los Angeles Ballet – reruns at 8. The final six perform at 9.

“Shear Genius,” 10 p.m., Bravo. When “Charlie’s Angels” debuted in 1976, even its hairstyles became famous. Tonight, contestants will try to re-create them with two original Angels (Jaclyn Smith and Kate Jackson) watching.