"2012 Summer Olympic Games" 7 p.m. to 10:08 p.m., NBC (New)

U.S. track and field medal hopefuls take on the strong Jamaican contingent in the women's 200-meter dash. Other track finals: women's 400-meter hurdles and long jump; men's 110-meter hurdles. Also tonight are the finals for women's beach volleybal and qualifying rounds for women's diving.

"Unraveled" 7 p.m. to 8:30 pm. Showtime (2011)

A documentary about Marc Dreier, the once-prominent Manhattan attorney who was arrested for orchestrating a massive fraud scheme that netted over $700 million from hedge funds.

"Dallas" 8 p.m. to 9:05 p.m., TNT (New, season finale)

In true "Dallas" fashion, the show will end its first season with a cliffhanger and some jaw-dropping family secrets that are guaranteed to leave fans anxiously waiting for season two. Along the way, Christopher and Elena learn some harsh truths about the people closest to them.

"Criminal Minds" 8 p.m., CBS

The B.A.U. team investigates a mass suicide among young cadets at a military academy, but Hotch and Morgan clash when it looks like a member of the team is in danger.