1) “Tough as Nails,” 9 p.m., CBS. Half of the 12 people have already been ousted from the individual contest, including a farmer, a welder and an ironworker. (They stick around, as part of the team competition.) That leaves a sheriff’s deputy, a Marine veteran, a drywaller, a fisherman, a forester and Young An (shown here), a firefighter. An should be in his element, as the teams head to a fire training facility. There, they must save a victim, extinguish a fire …. then rappel from the top of a four-story building.
2) Democratic convention, 8-11 p.m. ET, PBS; 10 p.m. ET, ABC, CBS and NBC; all day, news networks and C-SPAN. This is the night for Kamala Harris, the vice-presidential pick … and for Democratic women in general. One week from the 100th anniversary of women’s vote, the speakers (subject to change) from 9-11 p.m. ET, include Elizabeth Warren, Nancy Pelosi, Hillary Clinton, New Mexico Gov. Michelle Lujan Grisham, former U.S. Rep. Gabrielle Giffords and Harris; Barack Obama closes the night.
3) “United We Fall,” 8 p.m., ABC. Bill and Jo decided this is a universal truth: When you have kids, the weekend is worse than the week.
4) “The 100,” 8 p.m., CW. For a time, viewers thought the heroic Bellamy was dead. Last week, flashbacks showed how he survived. Alas, he’s now apparently a believer in the cult that wants to control the world; as the hour ended, he gave an important secret to its leader. Now Clarke must fix things in a hurry: After tonight, only four episodes remain in the seven-year, 100-episode run.
5) “Coroner,” 9 p.m., CW. Sprawling through the Toronto area is Crothers Woods, a 128-acre nature preserve. Now that’s key to a two-parter beginning here: When a dismembered body is found, Jenny must determine the identity and the reason for the death. That comes as her own life is in tatters: Her husband died of an aneurysm, leaving gambling debts; their son is taking a break from school.