Today on TV

Baseball playoffs: Angels at White Sox (6:20 p.m., Ch. 13); Astros at Cardinals (6:20 p.m., FX)

Still Standing (7 p.m., Ch. 2): Judy and Linda have to go to traffic school.

One Tree Hill (7 p.m., Ch. 30): The "kids" (played by actors who are, for the most part, in their mid-20s) get ready to head back to high school by throwing a beach party.

Lost (8 p.m., Ch. 4): We got some answers last week . . . but I don't have the slightest idea what they mean; I'm guessing just the way the rest of you are. As long as they can keep us guessing — and caring — they've got us hooked. As soon as we stop caring what the answers are, they're sunk. This week, we see more about Hurley's past.

Helen of Troy (8 p.m., Ch. 7): This documentary looks for truth behind the legend.

Veronica Mars (8 p.m., Ch. 24): Cassidy hires Veronica to investigate his stepmother.

CSI: NY (9 p.m., Ch. 2): Last week, Aidan Burn (Vanessa Ferlito) got fired — and the actress has indeed left the show. Tonight, Anna Belknap comes aboard as Lindsay Monroe, "a young, athletic and eager-to-please CSI who recently moved to New York from Montana," according to CBS. If Belknap looks familiar, she was in the cast of the series "Medical Investigation" last year; she was in the cast of "The Handler" the year before that; and she was in the cast of "Deadline" in 2000. If you didn't see any of those low-rated shows, you might have seen her on the high-rated "Without a Trace," where she showed up earlier this year in May's season finale and September's season premiere.

Invasion (9 p.m., Ch. 4): As if the aftermath of the hurricane and the aliens aren't enough, now a bunch of lab animals — baboons, to be exact — are on the loose, and they could infect the population with some nasty diseases.

Law & Order (9 p.m., Ch. 5): Well, you knew this show would have a take on the Terri Schiavo case, didn't you? In tonight's episode, a man planning to disconnect his comatose wife's feeding tube is killed by a car bomb.