Buffy the Vampire Slayer (8 p.m., WB) is still in reruns; this is the one where a meteorite unleashes a crawly thing and Joyce prepares for brain surgery. Nova (8 p.m., check local listings, PBS) presents "Survivor M.D.," a three-part profile of members of Harvard Medical School's Class of '91, 10 years into their careers. On a rerun of Angel (9 p.m., WB), our boy engages in some gladiatorial trials to save Darla's life. The new sitcom What About Joan (9:30 p.m., ABC) stars the lovable Joan Cusack (a supporting actress Oscar nominee for "In & Out" and "Working Girl") as a Chicago teacher on the verge of marriage. Kyle Chandler, Wallace Langham and Jessica Hecht round out the cast. Andy frets over Fancy's possible transfer and Diane and Connie search for a killer who dismembered his victim on NYPD Blue (10 p.m., ABC). Frontline (10 p.m., check local listings, PBS) presents the two-part "Organ Farm," a report on animal-to-human organ and cell transplants.
Raptors at Heat (8 p.m., TBS)
National Invitational Tournament (7 p.m., 9 p.m., ESPN)
Sabres at Penguins (7:30 p.m., ESPN2)
Rosie O'Donnell (syndicated) Rosie Perez, Jamie-Lynn Sigler
David Letterman (CBS) Nathan Lane, Shannon Elizabeth
Jay Leno (NBC) Paul Reubens, Phil Jackson, Shawn Colvin
Politically Incorrect (ABC) John Lydon, Molly Sims
Conan O'Brien (NBC) Dave Chappelle, Sarah Vowell (rerun)
Craig Kilborn (CBS) Uncle Kracker
All times Eastern unless noted.