Buffy the Vampire Slayer (8 p.m., WB) finds Buffy and the gang reeling in the wake of Joyce's apparent death. The Mole (8 p.m., ABC) winds down with the first hour of a two-part finale (continued Wednesday) in which the Mole will be unmasked, somebody will win some money and we can all sleep better at night. On Frasier (8 p.m. EST/9 p.m. PST, NBC) (note the time change), Niles makes an improbable half-court basket at a Sonics game. Speaking of Niles, David Hyde Pierce guests as a motivational guru on Titus (8:30 p.m., Fox). Nova (9 p.m., PBS, check local listings) presents "Cancer Warrior," a report on the quest by Boston Children's Hospital medical researcher Dr. Judah Folkman to starve cancer cells by cutting off their blood supply. On Angel (9 p.m., WB), our boy snaps out of his evil funk and comes crawling back to Cordelia, Wesley and Gunn. Frontline (10 p.m., PBS, check local listings) offers "The Merchants of Cool," media correspondent Douglas Rushkoff's look at how media conglomerates influence teenage consumers, and vice versa. Way back before he was a tabloid accident waiting to happen, Andy Dick was a cast member of Fox's short-lived but not-forgotten "Ben Stiller Show." Now, Dick (who's reportedly clean and sober) returns to his sketch comedy/parody roots with his new series, The Andy Dick Show (10:30 p.m., MTV), in which he spoofs pop cultural icons (boy bands, Tom Green, Christina Aguilera, "Making the Video," to name a few) with a heavy dose of MTV rudeness.
President Bush makes an address to the nation (9 p.m. EST/6 p.m. PST, ABC, CBS, NBC, CNN, FNN, MSNBC) before a joint session of Congress. He's expected to outline his plans to "move forward," and all that.
Sonics at Knicks (8 p.m., TBS)
Coyotes at Bruins (7 p.m., ESPN2)
Rosie O'Donnell (syndicated) Dylan McDermott, Hootie and the Blowfish
David Letterman (CBS) Heather Locklear, Emmylou Harris with Alison Moorer and Gillian Welch
Jay Leno (NBC) Dolly Parton, Heidi Klum
Politically Incorrect (ABC) Jay Mohr
Conan O'Brien (NBC) Jarod Miller, Mimi Rogers
Craig Kilborn (CBS) William Shatner, Kimmi Kappenberg
All times Eastern unless noted.