TONIGHT'S MUST-SEE

"1 vs 100" debut, 8 p.m., NBC. NBC scrambles to build on the success of "Deal or No Deal." Tonight, it airs a transplanted "Deal" at 7 p.m., then launches this show, from the same producers. Next week, "1 vs 100" steps into that 7 p.m. slot. Like "Deal," it's simple and addictive. Unlike "Deal," it involves at least a little thinking. A contestant faces "the Mob" — 100 people, many in categories. There are valedictorians, geniuses and "Deal" models; there's Ken Jennings, the "Jeopardy" champ. If the contestant gets an answer right, he gets money for each Mob member who was wrong. Those wrong people are ousted; if he beats them all, he wins $1 million. The questions keep getting harder and soon only the smartest Mobsters are left. The contestant can quit before any question, but if he misses one he loses everything. Many of the questions are absurdly easy, especially since contestants can twice use devices similar to "Millionaire" lifelines. Still, this is fun to watch, Bob Saget is a fairly good host, and the first contestants are likable.

OF NOTE

"Doctor Who," 5 p.m., Sci Fi Channel. Batlike creatures are in a London school.

"Battlestar Galactica," 6 p.m., Sci Fi Channel; reruns at 8. Here's the middle hour of the brilliant, five-hour stretch that opens the season. Word arrives that the Cylons plan to round up and kill all the suspected dissidents.

"Going to Pieces: The Rise and Fall of the Slasher Film," 6 p.m., Starz. In his 1960 "Psycho," Alfred Hitchcock proved that horror could be an art form. The real surge began with the 1978 "Halloween." Slasher films became the quickest route for new directors to get their start. This documentary looks at the trend, its decline and its return with the 1996 "Scream." It also views such trends as "final girl," "lone survivor" and the movie link between sex and death.

"Ghost Whisperer," 7 p.m., CBS. A box of ornaments seems to transmit visions to Melinda.

"Grey's Anatomy," 7 p.m., ABC. Here's a quick rerun of last night's episode, with Mark Sloane re-assert himself into Addison's love life.

"Men in Trees," 8 p.m., ABC. Marin learns more about Jack during a trip to Anchorage.

"Close to Home," 8 p.m., CBS. A Halloween murder suggests that a serial killer may be back.

"Law & Order," 9 p.m., NBC. Richard Brooks guests, in his old role of Paul Robinette. When this show started in 1990, Robinette was an assistant district attorney; now he's a defense attorney, working for a murder suspect.

"Numb3rs," 9 p.m., CBS. When an interpreter is killed, there are suspicions that this was tied to a spy scheme.