The third and last Presidential Debate (ABC, CBS, NBC, PBS, CSPAN, CNN, MSNBC, Fox News, CNBC, Univision, 9 p.m.) takes place tonight in Boca Raton, Fla., with CBS’ Bob Schieffer taking up the unenviable job as moderator between two candidates who nearly had to be physically separated in their last outing, and either way didn’t pay attention to time limits or their past moderators.

Foreign policy will be the meat of the debate and the winners and losers will likely be judged on how they look or their response as they listen as much as the content of their answers.

Still, this is the heavyweight programming of this fall and it’s been building to a knockout that may well come.

The Giants forced a Game 7 in the National League Championship with St. Louis at San Francisco (Fox, 8 p.m.). The winner faces the Tigers when the World Series begins Wednesday.

One of the immediate benefits of tonight’s debate is keeping the sprawling reality show episodes  to an hour. See how much they can accomplish on hour long versions of ‘Dancing with the Stars” (ABC, 8 p.m.) and “The Voice” (NBC, 8 p.m.).

Other than baseball, the main broadcast competition for the debate is “Gossip Girl” (The CW, 9 p.m.), in which you can consider Serena Obama and Blair Romney.

Not debate programs: neither “Girl vs. Monster” (Disney Channel, 8:30 p.m.), nor “RuPaul’s Drag Race” (Logo, 9 p.m.), which begins its fifth season as an all-star edition, featuring contestants from the past that may or may not include Detox, BaNaka, Penny Tration, Angel Dimons, Artemis Chase and Vivienne Pinay. Whoever it is, they better work!

Reruns come from “Big Bang Theory” (CBS, 8 p.m.) and “2 Broke Girls” (CBS, 8:30 p.m.).

“Switched at Birth” (ABC Family, 8 p.m.) wraps up its first season with a court decision.

I was wrong to think three episodes of a “reunion” would put an end to the season for “The Real Housewives of New York” (Bravo, 9 p.m.). Nope; tonight is a show using leftover footage.

“Anthony Bourdain: No Reservations” (Travel, 9 p.m.) visits a Haitian cemetery and celebrates Halloween in Transylvania.

Pauls Junior and Senior finally realize that feuding may make a couple good seasons of “American Chopper” (Discovery, 9 p.m.), but it doesn’t bode well for their motorcycle production business. So they get to talking.

“Breaking Amish” (TLC, 8 p.m.) begins doing that thing that happened to “Here Comes Honey Boo Boo” — showing old episodes “enhanced” by extra footage, so it’s more than a rerun. Sort of.

“Totally Clueless” (MTV, 7 p.m.) is the latest variation of a candid camera punk’d show. When victims realize they’re on TV, they win the money.

“Alphas” (Syfy, 8 p.m.) reaches its second season finale with a final confrontation with Stanton Parish.

Jeff Mauro looks for the best meals he can find in the U.S. at the cheapest prices, limiting himself to a couple dozen dollars for a day’s meals on the new “$24 in 24” (Food Network, 10:30 p.m.).

“Saturday Night Live” skits are the origin of two movies tonight: “Blues Brothers 2000” (Flix, 8 p.m.) and “It’s Pat” (Flix, 10 p.m.).

The 1978 John Carpenter original of “Halloween” (AMC, 8 p.m.) is certainly better than sequels  like “Halloween 4: The Return of Michael Myers” (AMC, 10 p.m.).

The month-long Monday night survey of Spencer Tracy movies becomes a de facto Katharine Hepburn salute as well, as it presents “Woman of the Year” (8 p.m.), “Without Love” (10 p.m.), “Adam’s Rib” (midnight), “Pat and Mike” (2 a.m.), “Keeper of the Flame” (3:45 a.m.) and “The Sea of Grass” (5:30 a.m.).

In Monday Night Football, it’s Lions at Bears (ESPN, 8:30 p.m.).

Daytime Talk

Kelly & Michael: Elisha Cuthbert, Victoria Justice, “Science Bob” Pflugfelder. Katie Couric: Susan Sarandon. The View: Madeline Stowe, Alanis Morissette. Ellen DeGeneres: Jessica Lange, Beth Behrs, Hunter Hayes.

Late Talk

David Letterman: Tom Hanks, Tony Bennett. Jay Leno: Halle Berry, Ali Wentworth, Gary Clark Jr. Jimmy Kimmel: Kevin James, Ezra Miller, Bloc Party (rerun). Jimmy Fallon: Gerard Butler, Madeleine Stowe, Felix Baumgartner, Wu-Tang Clan. Craig Ferguson: Bryan Cranston, Dr. Lisa Masterson. Carson Daly: Wyclef Jean, Eugene Jarecki, the Walkmen (rerun). Tavis Smiley: Adam Nagourney, Luciana Souza. Jon Stewart: D.L. Hughley.  Stephen Colbert: Donald Sadoway. Conan O’Brien: Aziz Ansari, Chuck Lorre, Kendrick Lamar. Chelsea Handler: Tyler Perry, Brent Morin, Jen Kirkman, Dov Davidoff.