TONIGHT'S MUST-SEE

"The Office" season finale, 7 p.m., NBC. With a corporate job apparently open, Michael, Jim and Karen all head to New York City for interviews. That leaves Dwight in charge of the office, making sudden changes. Meanwhile, Jan (Michael's regional boss) arrives with news. This could be an intriguing way to wrap up the season for a good show.

"Grey's Anatomy" season finale, 8 p.m., ABC. This show faces some key questions as it wraps up its season. Will Cristina and Burke really go ahead with their wedding? Will George and Callie stay in their marriage? How did the interns do in their first-year exams? And who will be the new chief of surgery? Much of that, apparently, will be answered in this extended episode.

"Lost: The Answers," 9:07 p.m., ABC. We'll never get all the answers in "Lost," but this hour (well, 53 minutes) reviews some we've had so far.

OF NOTE

"Bob Barker: A Celebration of 50 Years on Television," 7 p.m., CBS. Bob Barker carries around generations of television history. He started hosting "Truth or Consequences" on TV 51 years ago and launched what was then "The New Price is Right" 35 years ago. It's not new anymore; in fact, it's long been the only remaining game show on a broadcast network's daytime lineup. At 83, Barker looks strong physically and mentally. Being a vegetarian seems to have served him well; so did growing up on an Indian reservation in South Dakota, which helped give him the Carson-esque ability to let others be the stars. Now he's retiring from "Price," with his last new episodes airing sometime next month; here's an hour looking back at his life and career.

"Ugly Betty" season finale, 7 p.m., ABC. Daniel's excesses continue and Wilhelmina rises in power.

"Scrubs" season finale, 8 p.m., NBC. Elliot plunges ahead with her wedding plans with Keith, while facing some doubts. Meanwhile, J.D. invites Kim (Elizabeth Banks) to stay with him, so they can bond before their baby is born.

"CSI: Crime Scene Investigation," 8 and 9 p.m., CBS. First is the season finale, with good news (the miniature killer is caught) and bad news (Sara is missing). Then is a rerun in which a basketball player and a cheerleader disappear after a big game.

"ER" season finale, 9 p.m., NBC. You really didn't think Kovac would get to enjoy his honeymoon, did you? Now he must rush back to Croatia to see his ailing father. Gates is also called home for a crisis and Neela finds her life in peril.