Television

COMA If you have a heart, prepare to have it wrenched by this new documentary from Liz Garbus. She follows four people with traumatic brain injuries as they undergo their first year of treatment. Their loved ones and doctors share their stories in this powerful film. (N/CC/ESP/TVPG)

(1 hr. 45 mins.) (8 p.m. HBO)

JOHN RATZENBERGER'S MADE IN AMERICA Host John Ratzenberger gets an inside look at the making of Frito-Lay snacks. (CC/TVG) (30 mins.)

(9 p.m. TRAV)

NCIS A Navy lieutenant is putting a prototype smart vehicle through its paces. She tries to unbuckle her belt, and the vehicle traps her inside, where she's killed by exhaust. At first, it looks like sabotage by a mechanic at the company who made the vehicle; he was dating the victim. But wait! The truth is found in the software. (CC/HDTV/TVPG)

(1 hr.) (7 p.m. Ch. 11)

GILMORE GIRLS Christopher and Lorelai (David Sutcliffe, Lauren Graham) visit Rory (Alexis Bledel) at school on parents' weekend and find Emily and Richard (Kelly Bishop, Edward Herrmann) have come, too. (CC/HDTV/TVPG) (1 hr.)

(7 p.m. Ch. 33)

THE TWILIGHT ZONE Russell Johnson, best known as the Professor from Gilligan's Island, stars in the 1961 episode "Back There," which is airing as part of Sci-Fi's holiday Zone marathon. His character is sent back to April 14, 1865, the day President Lincoln was killed. (CC/TVPG) (30 mins.) (7:30 p.m. SCI-FI)

LETTERMAN Nicole Richie; comic Artie Lange; Chrisette Michele performs.

(10:35 p.m. Ch. 11)

LENO Actress Jessica Alba; actor Seth Rogen; Lucinda Williams performs. (10:50 p.m. Ch. 5)

CONAN Filmmaker George Lucas; actor Will Arnett; Chris Isaak performs; at the Orpheum Theatre in San Francisco.

(11:52 p.m. Ch. 5)

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