American Idol
Credit: Fox

In case there was any doubt that Fox’s American Idol wasn’t still enough of a powerhouse to give rivals a headache, let me introduce you to last night’s ratings.

Idol (15.8 million viewers, 5.0 adults 18-49 rating) won the night and gave Fox the highest-rated Tuesday performance of any network this season. The top 12 guys singing was about on par with last Wednesday’s edition of the show.

Nearly everybody else went down. For second place CBS, this wasn’t a huge deal with NCIS (18 million, 3.4) and NCIS: LA (15.7 million, 3.4). But Unforgettable (9.9 million, 1.9) was pretty borderline. All three were season lows in the adult demo, and yet: For the first time ever, NCIS delivered more viewers than a Tuesday edition of Idol.

NBC’s Biggest Loser (5.7 million, 2.0) hit a season low. The modest Parenthood (5.1 million, 1.9) finale rose 12 percent — too little too late?

ABC struggled. Last Man Standing (7.4 million, 2.1) and Cougar Town (4.3 million, 1.5) sunk to series lows. Given its performance since it returned, Cougar Town is looking unlikely to get a renewal with these numbers. Same goes for freshman series The River (4.1 million, 1.5), which fell 15 percent. Body of Proof (6.7 million, 1.3) was down 13 percent.

The CW’s Ringer (1.1 million, 0.4) was low.

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