Rachael vs. Guy Celebrity Cook-Off, 9 p.m., Food
This week the teams take to Coney Island, where they have to put their own twist on french fries. Uh, sorry, but how much more delicious can you make a french fry?
SEASON PREMIERE Inside Comedy, 11 p.m., Showtime
Comedy vet David Steinberg returns for a third season of chatting with fellow funny people about their craft. His guests tonight are actor Zach Galifianakis and Jimmy Fallon (more on him below).
SEASON FINALE The Biggest Loser, 9 p.m., NBC
The winner of Season 15 is crowned tonight, but not before all the contestants return to weigh in and show how much they've lost. Yeah, we get it, you've accomplished a lot, and we can't stop eating these Oreos on the couch. Stop rubbing it in!
New Girl, 9 p.m., Fox
Adam Brody (The O.C.) shows up in this episode as one of Jess' exes. Do you think he and Jake Johnson will throw down in a battle of the bros? Our money's on Johnson. He's scrappy.
Trophy Wife, 9:30 p.m., ABC
Bert, a.k.a. the most entertaining person on television, gets martial arts training in this week's episode. That is all.
American Idol, 8 p.m., Fox
New this season is a Hollywood or Home round, in which the contestants who made it through the audition rounds have to prove they deserve to be there before the Hollywood competition. Uh, this seems awfully redundant, but that's okay. We're only tuning in to see how orange Harry Connick Jr. is this week.
Wahlburgers, 10:30 p.m., A&E
So, this is a show that exists. Who knew? Named after a Boston burger joint cofounded by the Wahlberg brothers (Mark, Donnie and their non-actor brother Paul) in 2011, Wahlburgers follows the goings on at the restaurant and amid the bros, with frequent appearances from Marky Mark. In tonight's new ep, Mark calls Paul to tell him he's found the perfect site to open a new restaurant. Spoiler alert: It's Toronto.
The Tonight Show With Jay Leno, 11:35 p.m., NBC
Leno bids farewell to the desk after 22 years on the job, and we get to see how quickly Tonight Show viewers take to hashtag roundups when young whippersnapper Jimmy Fallon takes over as host on Feb. 17.
XXII Winter Olympics, 8 p.m., NBC
Hooray, the Winter Olympics found a way to add more figure skating! In an unusual move, the action gets going a day before the Opening Ceremony with, among other things, the debut of a team event in figure skating. Countries will compete in four different disciplines — men's, ladies, pairs and ice dancing — for one score, and hours of entertainment.
XXII Winter Olympics, 7:30 p.m., NBC
More than 2,500 athletes from 88 nations converge on Fisht Olympic Stadium in Sochi, Russia, for the Opening Ceremony of the Winter Olympics. NBC, in a desperate bid to goose ratings, isn't putting the ceremony online, so you'll have to stay home on a Friday night and tune in.
Late Night with Jimmy Fallon, 12:35 a.m., NBC
Well, Fal pals, this is it. Jimmy's last show as host of Late Night. Sure, he's going on to bigger and better hosting jobs, but we'll miss the little things about this show that are likely too strange to translate to an 11:35 p.m. time slot. Games like Wheel of Carpet Samples and Wax On Wax Off, or the bizarre Let Us Play With Your Look segment, where Fallon and a celeb guest don white outfits and matching blond wigs and "make over" an audience member. Ah, memories. Andy Samberg and the Muppets will appear on the final show tonight, following three days of best-of episodes Monday-Wednesday and a new episode Thursday with Colin Farrell and Chris Pratt.