Saturday and Sunday on TV

Horse racing (3 p.m., Ch. 5): The Kentucky Derby (which actually begins at 4:03 p.m.)

NBA playoffs: Pacers at Celtics (5 p.m., TNT); Rockets at Mavericks (7:30 p.m., TNT)

Auto Racing (5 p.m., Ch. 13): The Darlington 500

Harry Potter and the Chamber of Secrets (7 p.m., Ch. 4): The 2002 sequel. Which was, by the way, too long to begin with. And ABC has added 14 minutes to the running time — which means that, with commercials, this will run for four hours.

MLS soccer (8 p.m., Fox Sports Rocky Mountain and Fox Soccer Channel): Real Salt Lake at Chivas USA in the first of four matchups this season between the MLS's two newest teams.

The Chronicles of Riddick (9 p.m., HBO): Vin Diesel stars in this 2004 action/sci-fi flick. (PG-13)

Sunday on TV

NBA playoffs: ABC will carry either Game 7 of Wizards at Bulls (if necessary) or (if the Washington won on Friday) Game 1 of Wizards at Heat (1 p.m., Ch. 4); Spurs at Sonics (6 p.m., TNT)

60 Minutes (6 p.m., Ch. 2): Ray Romano tells Steve Kroft that he would be lost without his wife, Anna, who runs his life — especially his finances.

King of the Hill (6 p.m., Ch. 13): Hank talks Bobby into joining the track team, unaware that the coach is using Bobby to motivate his better runners.

Malcolm in the Middle (6:30 p.m., Ch. 13): Hal decides to run for president of the Neighborhood Association.

Cold Case (7 p.m., Ch. 2): A truck containing human bones is retrieved from a river. Hopefully, this episode will lack the Mormon-bashing that inexplicably marred last week's installment.

Extreme Makeover: Home Edition (7 p.m., Ch. 4): A firefighter with five kids gets his house redone.

The Simpsons (7 and 7:30 p.m., Ch. 13): Lisa agrees to participate in a Krusty-sponsored "Li'l Starmaker," turning Homer into the ultimate-awful stage dad; Homer becomes a prophet of doom.

Charmed (7 p.m., Ch. 30): Baby Wyatt's new "imaginary" friend is actually a demon.

Elvis (8 p.m., Ch. 2): Jonathan Rhys Meyers turns in a great performance in this two-part, four-hour biopic of the King of Rock 'n' Roll, which concludes Wednesday at 7 p.m.