This weekend on TV

College football: No. 2 Michigan at No. 1 Ohio State (1:30 p.m., Ch. 4); New Mexico at BYU (2 p.m., The mtn); Utah at Air Force (5:30 p.m., The mtn.)

NBA (7 p.m., Ch. 14): Suns at Jazz

Comic Relief (7 p.m., HBO and TBS): Billy Crystal, Whoopi Goldberg and Robin Williams host this benefit for Hurricane Katrina victims; scheduled performers include Roseanne Barr, Lewis Black, Dane Cook, D.L. Hughley, George Lopez, Ray Romano, Rita Rudner and Jon Stewart.

Saturday Night Live (10:30 p.m., Ch. 5): Ludacris is both host and musical guest.

Sunday on TV

NFL: Patriots at Packers (11 a.m., Ch. 2); Bears at Jets (11 a.m., Ch. 13); Colts at Cowboys (2:15 p.m., Ch. 2); Chargers at Broncos (6:30 p.m., Ch. 5)

Reba (6 and 6:30 p.m., Ch. 30): The sitcom returns with a pair of new episodes. In the first, Barbara Jean is hiding a secret; in the second, Reba gets a big business offer.

Amazing Race (7 p.m., Ch. 2): The Cho brothers' niceness starts to catch up with them.

Extreme Makeover: Home Edition (7 p.m., Ch. 4): A family who lost their father to cancer gets a new home.

Nature (7 p.m., Ch. 7): A look at "Christmas in Yellowstone."

The Simpsons (7 p.m., Ch. 13): Lisa helps Moe get his poetry published.

7th Heaven (7 p.m., Ch. 30): Ruthie reluctantly agrees to return home.

Cold Case (8 p.m., Ch. 2): A present-day suicide is tied to a 1989 murder.

Desperate Housewives (8 p.m., Ch. 4): Lynette is really suspicious of the new neighbor.

Masterpiece Theatre (8 p.m., Ch. 7): The conclusion of "Prime Suspect VII: The Final Act."

Without a Trace (9 p.m., Ch. 2): A social worker disappears.

Brothers & Sisters (9 p.m., Ch. 4): Sarah, Tommy and Kevin uncover their father's most shocking secret.

Desperate Crossing: The Untold Story of the Mayflower (9 p.m., History): Very good documentary re-creates what led the Pilgrims to decide to come to the New World and what happened when they got here.