Richard Hammond's Crash Course: Richard Hammond has less than five days to learn to become a Hollywood stuntman in the season premiere (7 and 10 p.m. BBC America).
Switched at Birth: The verdict comes in from the trial, and Daphne and Jeff (Katie Leclerc, Justin Bruening) confront a major obstacle in their relationship, while Bay and Zarra (Vanessa Marano, Tania Raymonde) head for Mexico in the season finale (8 p.m. ABC Family).
Gossip Girl: Blair (Leighton Meester) gets help with her first fashion show from an unexpected source, but some behind-the-scenes scheming erupts in scandal. Blake Lively, Barry Watson and Ed Westwick also star in this new episode (9 p.m. KTLA).
Vegas Strip: This series, which starts its third season tonight, follows police officers patrolling the hardest-partying areas of Las Vegas (10 p.m. TRU).
$24 in 24: In New York City, host Jeff Mauro has his work cut out for him as he attempts to feed himself for a day on only $24 in this new episode (10:30 p.m. Food).
Presidential debate: Bob Schieffer moderates from Lynn University in Boca Raton, Fla. (6 p.m. CBS; NBC; KTLA; ABC; KCAL; KOCE; CNBC; CNN; CSPN; Fox News Channel; Fox Business; MSNBC).
Scream-Worthy Movies: This new special counts down spine-chilling scenes from scary movies (9 p.m. TV Guide).
Contraband: A former smuggler (Mark Wahlberg) finds himself back in the game to settle his brother-in-law's debt to a ruthless drug lord. Kate Beckinsale also stars in this 2012 thriller (10 p.m. Cinemax).
Baseball: National League Championship Series: The St. Louis Cardinals visit the San Francisco Giants (If necessary) (4:30 p.m. Fox).
Football: The Detroit Lions visit the Bears (5:30 p.m. ESPN).
Preseason basketball: The Golden State Warriors visit the Clippers (7:30 p.m. FS Prime).