What to Watch: Wed, July 18

Patrick Duffy in Dallas

Dallas
6 p.m. & 11 p.m., Bravo
Tonight’s show, “Collateral Damage,” exposes Rebecca’s life-changing secret; meanwhile, a family associate is murdered, leading everyone to wonder about the culprit.

The Virgin Diaries (New Series)
7 p.m. & 9 p.m., TLC
In TLC’s new series profiling adult virgins, viewers will meet Skippy, a 34-year-old man who lives in his parents’ basement, uses his mother as his “Wing Mom” and celebrates his sexual non-activity with a line of T-shirts bearing slogans like “Virginity Rocks.”

Deal With It (Season Finale)
7:30 p.m., W
This hidden-camera prank show wraps up its season with more contestants trying to shock and embarrass their friends and family in an attempt to win a cash prize.

So You Think You Can Dance
8 p.m., CTV & Fox
After two of the Top 20 are shuffled off, the remaining 18 are given a chance to perform for the judges once again.

America’s Got Talent
9 p.m., Citytv & NBC
After performance episodes on Monday and Tuesday, the results are in as the judges reveal which acts made it to the top 24.

Decade of Discovery
10 p.m., KCTS
Within the past 10 years, explorers and scientists around the world have discovered more than 250,000 new species, and this BBC series takes a look at some of these unusual creatures, including an insect as long as the human arm, a shark that walks on land and a carnivorous plant that you could fit your fist inside — but wouldn’t want to.

CSI: Crime Scene Investigation
10 p.m., CTV2 & CBS
Things become unusually complicated when several people confess to brutally killing an entire family, and the CSIs must figure out who’s telling the truth and who’s fibbing.