NEW GIRL: Jess introduces Nick to her ex-boyfriend, Berkley, played by guest star Adam Brody. (Greg Gayne/FOX)

“Winter Gold: NBC’s First Look at the Sochi Olympics” (NBC at 8 p.m.) is a neat introduction to what the network has planned for the upcoming Winter Games, which begin Friday.

After Spencer’s board shorts revelation on “Pretty Little Liars” (ABC Family at 8), she’s more determined than ever to prove her theory to the other girls, but her sleepless nights and prescription medication use make Hannah start to notice her odd behavior.

The search is still on for the terrorist on “NCIS” (CBS at 8), while the murder of a Port Authority officer reveals Parsa’s possible whereabouts.

The American Experience documentary “The Amish: Shunned” (MPT and WETA at 9) follows seven people who have chosen to leave their Amish communities as they struggle to make their way in modern America. Also, we see the heartbreak felt by Amish men and women when a loved one leaves.

FINALE WATCH: The winner of the $250,000 prize is crowned on the season 15 live finale of “The Biggest Loser” (NBC at 9). Then, the eliminated players return to weigh in for the $100,000 at-home prize.

Following Sunday night’s episode featuring Prince, “New Girl” (Fox at 9) is back with Nick running into his ex Caroline and Jess encouraging him to be friends with her. Adam Brody guest stars.

Premiering in a new time slot to replace “The Mindy Project,” which goes on hiatus until April, “Brooklyn Nine-Nine” (Fox at 9:30) celebrates Capt. Holt’s birthday, but the gang gets off on the wrong foot with his husband.

On “Killer Women” (ABC at 10), Molly hunts down a serial killer who murders women who remind her of her abusive mother.

Reese returns to New York on the latest “Person of Interest” (CBS at 10) just when the Machine supplies the number of an antiquities thief, launching events that lead the team onto an elaborate heist.

Actor George Clooney comes to the “Late Show With David Letterman” (CBS at 11:35), with musical guest Sting.

Actor Matthew McConaughey and sports analyst Charles Barkley are on “The Tonight Show With Jay Leno” (NBC at 11:35), with music from Lyle Lovett.

Actor Barkhad Abdi and television personality Mehmet Oz stop by “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from the Lone Bellow.

— Rachel Lubitz