A Gifted Man: Fans of "Law & Order: Special Victims Unit" might do a double take at seeing Diane Neal — who played assistant prosecutor Casey Novak — playing a defense attorney in in this new episode (8 p.m. CBS).
Who Do You Think You Are? In this new episode, Marisa Tomei attempts to unravel a true story that sounds like something out of a movie. She grew up hearing that her great-grandfather was quite a shady character — a womanizer and gambler who paid for his vices with his life — and she goes to Italy to learn the truth (8 p.m. NBC).
Kitchen Nightmares: In this new episode, Gordon Ramsay tries to help the 50-year-old Fremont steakhouse Spin-A-Yarn. His mission: to bring the restaurant into the 21st century without losing the charm that's made it a favorite for decades (8 p.m. Fox).
Supernatural: In this new episode, Sam and Dean (Jared Padalecki, Jensen Ackles) investigate a series of deaths linked to a pizza chain that caters to kids (9 p.m. KTLA).
Michael Feinstein's American Songbook: In this new episode, a previously undocumented song is located (9 p.m. KOCE).
Merlin: After engineering an attack on Arthur's (Bradley James) party, Morgana (Katie McGrath) captures Merlin (Colin Morgan) and puts a spell on him that makes him want to kill Arthur (10 p.m. Syfy).
Good Eats: Turn on the Dark: Alton Brown is back with an all-new special that focuses on chocolate — the sweet and the bitter — just in time for Valentine's Day (8 p.m. Food).
Valentine's Day Massacre: Johnny Fratto, son of Al Capone associate Louis "Lew" Fratto, uses guns, graphics and grit to expose the myths and reveal the truth behind the St. Valentine's Day Massacre of 1929 (10 p.m. National Geographic).
Pro hockey: The Ducks visit the Detroit Red Wings (4:30 p.m. FS Prime).