A second season of “Undercover Billionaire” (Discovery, 8 p.m.) begins with three entrepreneurs competing to create $1 million businesses in 90 days by starting with only $100. It’s followed by a new series following someone from the first season, when Glenn Stearns returns to Erie, Pa., where he built his Underdog BBQ restaurant on “Undercover Billionaire: Comeback City” (Discovery, 10 p.m.), in which he tries to help other Erie businesses. 

Dr. Marcel is confronted by his past on “Chicago Med” (NBC, 8 p.m.), there’s an aerial ladder mishap on “Chicago Fire” (NBC, 9 p.m.) and a child is found wandering the street on “Chicago P.D.” (NBC, 10 p.m.). 

Amanda Pet, Zachary Quinto and Karamo Brown play “Who Wants to Be a Millionaire” (ABC, 8 p.m.) — the first of three consecutive episodes tonight. 

I like the idea of “Frozen in Time” (HGTV, 9  p.m.), when they look at a house from 1961, and, at 9:30 p.m., from 1958. 

“Trafficked with Mariana van Zeller” (National Geographic, 9 p.m.) looks at one black market that will be familiar to viewers of “The Tiger King.”  

Drew Carey does double duty with another episode of “The Price is Right at Night” (CBS, 8 p.m.). 

“Married at First Sight” (Lifetime, 8 p.m.) prepares for net week’s 11th season premiere. 

Sophie gets her daughter ready for college on “The Real Housewives of Orange County” (Bravo, 9 p.m.). 

“The Real Housewives of Salt Lake City” (Bravo, 10 p.m.) celebrates Valentine’s Day. 

Turner Classic Movies begins a series of Whodunit Wednesdays this month starting with a pair of Agatha Christie tales, “Death on the Nile” (8 p.m.) and “Evil Under the Sun” (10:30 p.m.), followed by “The Last of Sheila” (12:45 a.m.), “Manhattan Murder Mystery” (3 a.m.) and “Deathtrap” (5 a.m.).

Earlier today are films of child actor Freddie Bartholomew in “Anna Karenina” (6 a.m.), “David Copperfield” (7:45 a.m.), “The Devil is a Sissy” (10 a.m.), “Little Lord Fauntleroy” (11:45 a.m.), “Captains Courageous” (1:30 p.m.), “Lord Jeff” (3:30 p.m.), “Listen, Darling” (5 p.m.) and “A Yank at Eton” (6:30 p.m.). 

NBA action includes Boston at Miami (ESPN, 7:30 p.m.) and Clippers at Golden State (ESPN, 10 p.m.). 

Men’s college basketball includes Rhode Island at Richmond (CBS Sports, 6 p.m.), Arkansas at Tennessee (ESPN2, 7 p.m.), Georgetown at Butler (Fox Sports 1, 7 p.m.), St. John’s at Xavier (CBS Sports, 8 p.m.), Oklahoma at Baylor (ESPN2, 9 p.m.), Seton Hall at Creighton (Fox Sports 1, 9 p.m.), Texas A&M at South Carolina (ESPNU, 9 p.m.), Utah State at New Mexico (CBS Sports, 10 p.m.) and Air Force at Boise State (Fox Sports 1, 11 p.m.). 

Daytime Talk

Kelly Ripa and Ryan Seacrest: Tim Allen, Julia Collin Davison. The View: Ken Jeong. The Talk: Jane Krakowski. Ellen DeGeneres: Diane Keaton, Isla Fisher (rerun). Drew Barrymore: Charlize Theron, Eitan Bernath. Kelly Clarkson: Mayim Bialik, Bobby Moynihan, Andrew Rea, Don Miguel Ruiz. Tamron Hall: Andrew Gollum, R. Jai (rerun). Wendy Williams: Karamo Brown. The Real: S. Epatha Merkerson. 

Late Talk

Stephen Colbert: Samantha Bee, Paul Mescal. Jimmy Kimmel: Regina King, Jake Tapper, Best Coast. Jimmy Fallon: Don Cheadle, Taylor Kinney, Michael Kiwanuka. Seth Meyers: Samantha Bee, Paul Mescal. Seth Meyers: Ted Danson, Chris Coleman. James Corden: Hailee Steinfeld, Jim Gaffigan, Seventeen. Lilly Singh: Phoebe Robinson (rerun). Conan O’Brien: Thomas Middleditch (rerun).