Winter Olympics (8 p.m., NBC): And so it begins. In an unusual bit of scheduling, action at the Winter Olympics gets rolling a day before the Opening Ceremony in Sochi, Russia. Tonight's slate includes competition in two new events: Team figure skating and slopestyle snowboarding.
"The Big Bang Theory" (8 p.m., CBS): It's a "Big Bang" Valentine as Amy (Mayim Bialik) takes nerdy Sheldon (Jim Parsons) to California's wine country for a romantic getaway at a bed-and-breakfast inn. Of course, it's separate rooms and the sexually naive Sheldon is only going along because a train ride is involved.
"Tonight Show" (11:34 p.m., NBC): After a 22-year run in which he typically dominated the late-night ratings, Jay Leno says farewell to the "Tonight Show" (again). His final guest was also his first -- Billy Crystal. On Feb. 17, Jimmy Fallon takes over as host.
Also on Thursday: