Tonight's Picks: Thursday, May 15

Hourlong season finale of NBC's "The Office" focuses on the impending departure of long-suffering HR drone Toby (Paul Lieberstein), whose replacement is played by guest star Amy Ryan.

Season finale of CBS' "CSI" focuses on the departure of Warrick Brown, played by Gary Dourdan, whose recent drug arrest parallels the character's problems. Dourdan didn't kill anybody, though; we're not so sure about Brown.

ABC's "Lost" has two more episodes to go this season, and if you feel the earth move, apparently that's just Locke moving the island. Or possibly the whole show jumping the shark. Tonight, the battle with the freighter people begins.