<i>Lost</i> Lost

Lost's sixth and final season premiere was up 12 percent over last year's opener, but American Idol continued to dominate Tuesday nights.

Read our Lost and American Idol recaps

's two-hour premiere averaged 12.1 million viewers and dominated the adults-18-to-49 demographic in both timeslots. It was the ABC's best two-hour performance since November 2007. ABC kicked off the night with a Lost clip show, which pulled in a decent 10 million viewers.

Fox dominated at 8 o'clock, however, as American Idol's Denver auditions drew 24.4 million viewers. That placed well ahead of NCIS (19.1 million viewers) and NBC's Biggest Loser repeat (5 million viewers).

Though Lost won the demo every half hour from 9 to 11 o'clock, CBS averaged more viewers with NCIS: Los Angeles (16.4 million viewers) and The Good Wife (12.7 million viewers). Kitchen Nightmares (9.3 million viewers) was competitive, and NBC's two-hour Biggest Loser pulled in 9.5 million in its hour-later timeslot.

90210 and Melrose Place repeats both pulled in fewer than 1 million viewers for the CW.