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Glee proved it was no freshman fluke, according to overnight Nielsen estimates.

Fox was No. 1 for the night as the musical dramedy drew 12.3 million viewers and its second-highest rating ever among the 18-to-49 demographic. Tuesday night's Season 2 premiere was also up 57 percent over Glee's premiere last fall (which was a repeat of its spring preview), and it was the night's highest-rated series in the demo.

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Fox's new comedies, Raising Hope (7.5 million viewers) and Running Wilde (5.9 million viewers) lost a large chunk of the lead-in, but performed better than So You Think You Can Dance did in the time slot a year ago.

CBS placed second overall for the night, though NCIS (18.9 million viewers) was still the night's most-watched program. It was, however, down about 19 percent from the previous season's premiere. A two-hour block of NCIS: Los Angeles averaged 14.7 million viewers, a dip from the more than 18 million viewers that tuned into the series premiere a year ago.

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ABC took third place, led by the Dancing with the Stars results show, which drew 18.3 million viewers, the largest audience ever for a Week 1 results show. (A Dancing recap the hour before drew 12 million viewers.) The Dancing lead-in helped new cop drama Detroit 1-8-7 grab 9.8 million viewers, but the show was down 8 percent in the demo from The Forgotten's performance last fall.

 Detroit 1-8-7 did manage to tie Parenthood (5.9 million viewers) in the demo, with the NBC family drama losing 11 percent from its premiere a week ago. NBC took fourth place overall, as The Biggest Loser (7.2 million viewers) had its lowest-rated premiere ever, falling 24 percent from the previous year.