Class-DivideIn part due to the High Line park in New York, crazy expensive apartments went up, often right across the street from existing housing projects, creating an even more jarring contrast been rich and poor. Marc Levin talks to people on both sides in “Class Divide” (HBO, 8 p.m.) and gets his most poignant responses from children – some in public school, others in a $40,000 a year private one that just opened.

On the 18th season premiere of “Independent Lens” (PBS, 9 p.m., check local listings), “Best of Enemies” looks at the remarkably abrasive debates between William F. Buckley and Gore Vidal held during the 1968 conventions. Their corrosiveness will look sadly familiar to today’s audiences.

Later, the one-hour “Willie Velasquez: Your Vote is Your Voice” (PBS, 10:30 p.m., check local listings) profiles a Mexican-American activist who registered millions of Latino voters in the 70s.

New shows are still premiering, with “Timeless” (NBC, 10 p.m.), a big budget sci-fi potboiler that involves chasing a villain through different historical events, starting with the crash of the Hindenburg. Oh the humanity.

Of course, a history professor is the wrong person to be plucked out of class to run the secret time-hopping team. But the fact it’s Abigail Spencer, who is so good in “Rectify” eases the jolt. Also part of the team, a too-handsome swashbuckling agent (Matt Lanter) and a scientist played by Malcolm Barrett, who brings up racial disparities in different eras. The hand of Shawn Ryan of “The Shield” fame is not immediately discernible amid the network gloss and general unbelievability of the premise.

Not much more believable is “Conviction” (ABC, 10 p.m.), a slight twist on police procedurals stars Hayley Atwell, the former Agent Carter, as the head of a unit looking to free the wrongly convicted. Also: she’s a former First Daughter and had to take the job due to blackmail, to keep her from being busted for cocaine and embarrassing her mother, who is running for the Senate. Shawn Ashmore, Eddie Cahill, Bess Armstrong, Merrin Dungey and Manny Montana round out the cast.

A third season starts for “Scorpion” (CBS, 9 p.m.) with hackers targeting major cities after they take control of military aircrafts and warships..

On the new “Yours, Mine or Ours” (Bravo, 10 p.m.), couples decide whether to buy new homes or remodel their existing ones.

A new season starts for the “Halloween Baking Championship” (Food, 9 p.m.). There’s also a Halloween takeover on “Chopped” (Food, 8 p.m.),

It’s Cirque du Soleil night on “Dancing with the Stars” (ABC, 8 p.m.) and I don’t particularly want to see Rick Perry doing a cartwheel.

Seeing an opening for sociopaths in politics, Penguin runs for mayor on “Gotham” (Fox, 8 p.m.).

The guys on “The Big Bang Theory” (CBS, 8 p.m.) struggle to meet their government project deadline.

In the new series “Milo Murphy’s Law” (Disney XD, 8 p.m.), the great-great-great-great grandson of the originator of Murphy’s Law meets the new kid in school.

Blind auditions continue on “The Voice” (NBC, 8 p.m.), where Miley Cyrus seems to be dressing in the dark as well.

On “Kevin Can Wait” (CBS, 8:30 p.m.), Kevin tries to do the household chores with an app.

Tricia Helfer looks a little too young to be the mother of “Lucifer” (Fox, 9 p.m.).

Nicole books her first national commercial on “Loosely Exactly Nicole” (MTV, 10:30 p.m.).

Moniece gets even with Brandi on “Love & Hip Hop Hollywood” (VH1, 8 p.m.).

“Black Ink Crew: Chicago” (VH1, 9 p.m.) returns for a second season.

Ashton Kutcher and Danny Masterson get mixed up somehow with “WWE Monday Night Raw” (USA, 8 p.m.).

Meghan opens a candle store on “The Real Housewives of Orange County” (Bravo, 9 p.m.).

The title of the update “90 Day Fiance: Happily Ever After?” (TLC, 10 p.m.) seems to suggest that they are not.

Christopher Lee is star of the month on Turner Classic Movies with a 42-movie Monday night showcase. It begins tonight with “Jinnah” (8 p.m.), “The Lord of the Ring: The Fellowship of the Ring” (10 p.m.), the 1973 “The Three Musketeers” (1:15 a.m.), the 1975 sequel “The Four Musketeers” (3:15 a.m..) and the 1948 “The Three Musketeers” (5:15 p.m.).

Monday Night Football has Giants at Vikings (ESPN, 8:15 p.m.).

Preseason hockey includes Rangers at Philadelphia (NHL, 7 p.m.) and Arizona at Vancouver (NHL, 10 p.m.).

Preseason basketball has Oklahoma City at Real Madrid (NBA, 2:30 p.m.), Milwaukee at Chicago (NBA, 8 p.m.) and Utah at Portland (NBA, 10:30 p.m.).

Daytime Talk

Kelly Ripa: Kenan Thompson, Chris Gerhard, Jerry O’Connell. The View: Sheryl Crow, Mindy Kling, Gretta Monahan. The Talk: Dolly Parton, Natalie Morales. Harry Connick: Jason Derulo, Carol Burnett. Ellen DeGeneres: Sean “Diddy” Combs, Milo Ventimiglia, Stevie Nicks. Wendy Williams: Michelle, Scott Evans. The Real: Jay Ellis.

Late Talk

Stephen Colbert: Mindy Kaling, Gary Owen, Sum 41. Jimmy Fallon: Emily Blunt, Mario Batali, Chance the Rapper. Seth Meyers: Martha Stewart, Haley Bennett, Stanton Moore. James Corden: Jamie Lee Curtis, Kumail Nanjiani, Clayton Kershaw, Skylar Grey. Carson Daly: Lucy Lawless, Bob Mould, Travis Rice. Trevor Noah: James Marsden. Conan O’Brien: Kevin Nealon, Mike Colter, Amos Lee.