Buffy is distracted by her mother's medical problems while the gang tackles a demon that rode into town on a meteorite on Buffy the Vampire Slayer (8 p.m., WB). Nova (8 p.m., PBS, check local times) visits the Seychelles, the Indian Ocean archipelago its discoverer believed was the site of the Garden of Eden. Donny sues Frasier over Daphne's leaving him at the altar on Frasier (9 p.m., NBC). Scientific American Frontiers (9 p.m., PBS, check local times) examines the limits of human endurance and performance. Angel undertakes a series of physical trials to try and save Darla's life on Angel (9 p.m., WB). Lily doesn't like what working for Miles Drentell is doing to Rick on Once & Again (10 p.m., ABC).

Sports

Basketball:
Raptors at Mavericks (8 p.m., TBS)
Pacers at Lakers (10:30 p.m., TBS)

Talk

Rosie O'Donnell (syndicated) Noah Wyle, Jewel
David Letterman (CBS) Christina Aguilera
Jay Leno (NBC) David Schwimmer, Mark Knopfler
Politically Incorrect (ABC) Al Franken
Conan O'Brien (NBC) Noah Wyle, Dan Hicks and the Hot Licks

All times Eastern unless noted.