Now, where are we going into tonight's season (series?) finale? Tom, who we know is a dead man, made a deal with Lenny (the guy who stole Lenny's identity years ago, actually), and Lenny turned on the Tobins after Joe turned him out. Joe has already gone bonkers: How much further will he sink? What's with Patty and the horse? And with Julian Decker? And look for more developments in the Season 1 murder of David Connor. (Watch out, Arthur Frobisher!) At the very least, Ellen can take comfort in that.
* House (8/7c Fox)
Last week, Cynthia Watros reprised her Libby role on Lost and fell for Hurley (again), and now she's stepping onto another romantic minefield, playing one of Wilson's exes who's coming back for more. And this isn't a one-shot deal: Watros is in next week's guest cast, too. Meanwhile, House and the gang are at a Renaissance village where folks actually live like knights in shining armor (one of whom is dying mysteriously) and their fair ladies. Thirteen is notably intrigued by it all.
Dr. O'Hara's love life is at the heart of things in this involving episode. After her one-nighter with nurse Sam, she begins to feel pressured and practically stalked by him. He, however, just wants a moment alone with her to straighten things out. And Jackie becomes privy to O'Hara's "sophisticated...swanky [past] life" when the doctor fesses up that she's had an ongoing relationship with a well-known and respected foreign correspondent (Julia Ormond) who is being reassigned to the States.
* Romantically Challenged (9:32/8:32c ABC)
This ensemble comedy looks at the love lives (such as they are) of four friends, who, between them, don't have the first clue about dating. There's Rebecca (Alyssa Milano), a lawyer and mom who's newly divorced after 15 years of marriage; her younger sister, Lisa; Rebecca's best friend, Perry, the hopeless romantic; and his roommate, Shawn, the commitment-phobic would-be novelist. In the opener, Lisa advises Rebecca to try a one-night stand. Good call. How could that possibly go wrong for a woman who hasn't dated since Clinton was president?
* Explorer: 25 Years (9/8c National Geographic)
The National Geographic Channel's signature series, Explorer, has documented some pretty remarkable events since it premiered on Nickelodeon in 1985. To celebrate its 25 years on the air, Lisa Ling is hosting a two-hour special that looks back at the most riveting topics the acclaimed anthology has covered, from the first glimpse at the undersea wreckage of the Titanic in 1987 to Ling's own daring undercover report from inside North Korea in 2007 and the exclusive 2009 tour of the controversial detention center at Guantanamo.