Robin Tunney and Simon Baker, <I>The Mentalist</i> Robin Tunney and Simon Baker, The Mentalist

Tuesday's tallies:

8 pm/ET
Let the stinging singing begin. American Idol averaged 25.1 million total viewers over its two-hour run, a 13 percent drop from last year's first big croon-off. Placing second in the hour, NCIS held steady at 18 mil.

The Biggest Loser (8.9 mil) was the biggest loser of the night at Idol's hand, shedding 13 percent of its week-ago audience.

9 pm
Opposite the second hour of Idol (noooo, don't go near The Police!), The Mentalist only dipped 7 percent from last week's all-time high. In other words, barely a hair on Simon Baker's head was mussed.

10 pm
Without a Trace's yo-yo act continued, with the procedural this week slipping 16 percent, to 12.2 million viewers. SVU placed second with 9.45 mil (down 900K), yet topped the demos.