On a new episode of Buffy the Vampire Slayer (8 p.m., WB), Buffy broods over messing it up with Riley, while Willow and Anya accidentally conjure a nasty troll. The new reality series The Mole (8 p.m., ABC) debuts. Ten people are sent on group missions around the globe, but the real mission is to discover the ringer in their midst. The contestant who knows the least about the mole's identity at the end of each episode is "executed" -- metaphorically speaking. Come on, you know you'll be watching. On Frasier (9 p.m., NBC), the doctor is gripped by an existential crisis after winning a lifetime achievement award. The new sitcom Three Sisters (9:30 p.m., NBC) stars Vicki Lewis, A.J. Langer and Katherine LaNasa as sibs with the usual relationship problems. Dyan Cannon plays their mom. NYPD Blue (10 p.m., ABC) returns to ABC's lineup for an eighth season. Andy awaits word about his son's health, while the squad is under scrutiny from internal affairs over the Kirkendall affair. And congratulations if you remember any of that; it's been a long time.
Jazz (9 p.m., PBS, check local listings) continues with a look at the early careers of Louis Armstrong and Duke Ellington.
Spurs at Magic (8 p.m., TBS)
Rosie O'Donnell (syndicated) Geraldo Rivera, Cynthia Nixon, Seal
David Letterman (CBS) Tim Robbins, Julie Bowen, Jackie DeShannon
Jay Leno (NBC) Eddie Izzard, Outkast
Politically Incorrect (ABC) Wanda Sykes, Scott Hamilton
Conan O'Brien (NBC) Charlie Sheen, Bruce Hornsby
Craig Kilborn (CBS) Phil Simms
All times Eastern unless noted.