“Killer 90s” (Investigation Discovery, 9 p.m.) looks once more at the Mary Kay Letourneau case, about an elementary school teacher who had an affair with a student. 

In the made-for-TV “Unthinkably Good Things” (Hallmark, 9 p.m.), three woman travel to Tuscany and reconsider their lives. Karen Pittman, Erica Ash and Joyful Drake star. 

The made-for-TV thriller “Danger in the House” (Lifetime, 8 pm.) concerns another bad hiring choice: That of a caretaker for an ailing mother. 

“90 Day Fiance: Happily Ever After?” (TLC, 8 p.m.) has a season premiere, hoping to answer that questions about couples from the previous season. 

A grizzly mauling leads to a rescue mission on “Naked and Afraid XL: Frozen” (Discovery, 8 p.m.).

“Colosseum” (History, 9 p.m.) recalls the reign of Emperor Commodus, who got involved in the games. 

A season finale comes for the drama “Animal Kingdom” (TNT, 9 p.m.) with the Codys working on their most dangerous mission yet. 

In the made-for-TV romance “Styled with Love” (UPtv, 7 p.m.), a personal stylist hires a photographer to help the business. 

“Big Brother” (CBS, 8:30 p.m.), delayed due to football, reunites the house and there is some explaining to do. 

Orel Hershiser, Kurt Warner, Mysterio and the Miz play “Celebrity Family Feud” (ABC, 8 p.m.). Other game shows tonight have “The $100,000 Pyramid” (ABC, 9 p.m.) and “The Final Straw” (ABC, 10 p.m.). 

And who, you might ask, is Mysterio? Well, he’s profiled tonight on “Biography: WWE Legends” (A&E, 8 p.m.) and his beef with Eddie Guerrero is featured on “WWE Rivals” (A&E, 10 p.m.).

Dee resists her violent past to protect her child on “Tales of the Walking Dead” (AMC, 9 p.m.). 

On “Lone Star Law” (Animal Planet, 9 p.m.), a felon interrupts a police firearms training session. 

Dessert chefs from three states challenge the host on “Alex vs. America” (Food, 9 p.m.). 

“Chesapeake Shores” (Hallmark, 8 p.m.) has a scavenger hunt. 

The documentary about the artist JR is rerun, “Paper & Glue” (MSNBC, 10 p.m.). 

“The End of Nye” (Syfy, 10 p.m.) looks at solar flares. 

Tiff opens up to Rob on “The Chi” (Showtime, 9 p.m.). 

On “City on a Hill” (Showtime, 10 p.m.), Jackie continues his fling with Letitia. 

An encounter with Howard leaves Kanan rattled on “Power Book III: Raising Kanan” (Starz, 9 p.m.).

Cary Grant is star all day on Turner Classic Movies with “Suzy” (6 a.m.), “Every Girl Should Be Married” (7:45 a.m.), “Gunga Din” (9:15 a.m.), “Penny Serenade” (11:15 a.m.), “The Philadelphia Story” (1:30 p.m.), “Suspicion” (3:30 p.m.), “North by Northwest” (5:30 p.m.), “Houseboat” (8 p.m.), “Mr. Blanding’s Builds His Dream House” (10 p.m.), “His Girl Friday” (midnight), “Mr. Lucky” (2 a.m.) and “In Name Only” (4 a.m.). 

Baseball includes Angels at Toronto (MLB, 1:30 p.m.), Yankees at Oakland (MLB, 4:30 p.m.) and Atlanta at St. Louis (ESPN, 7 p.m.). 

The final day of preseason football has Giants at Jets (NFL, 1 p.m.) and Detroit at Pittsburgh (CBS, 4:30 p.m.).

WNBA finals go to the semifinals with Seattle at Las Vegas (ESPN, 4 p.m.) and Connecticut at Chicago (ESPN2, 8 p.m.). 

The Belgium Grand Prix (ESPN2, 9 a.m.) is run this morning. Rained out Saturday, NASCAR’s Coke Zero Sugar 400 (NBC, 10 a.m.) will be tried again from Daytona. 

Final rounds are played in the PGA Tour Championship (Golf, noon; NBC, 1:30 p.m.) and the CP Women’s Open (CBS, 1:30 p.m.).

Women’s hockey world championship has Japan vs. Canada (NHL, 9 p.m.).

Women’s college soccer includes Minnesota at Mississippi State (ESPNU, 1:30 p.m.). 

The Little League championship game has Hawaii vs. Curacao (ABC, 3 p.m.). The third place, played earlier, will have Nolensville, Tenn. vs. Chinese Taipei (ESPN, 10 a.m.).

Sunday Talk

ABC: Sens. Bernie Sanders and Roy Blunt. CBS: Democratic National Committee Chair Jaime Harrison, Ukranian Ambassador Oksana Markarova, Maryland Gov. Larry Hogan. NASA Astronaut Kate Rubins. NBC: Rep. Adam Kinzinger, NASA Administrator Bill Nelson. CNN: Sen. Elizabeth Warren, New Hampshire Gov. Chris Sununu.