Erica Durance and Sam Witwer, Smallville

Thursday's ratings recap:

8 pm/ET
Survivor: Gabon dropped nearly a million total viewers week-to-week, topping the hour with 12.18 mil. Ugly Betty placed second with 8.95 mil, up 400 thou. In third, both NBC's Earl (6.62 mil, +450K) and Kath & Kim (5.57 mil, +110K) saw increases.

Smallville hit a season high of 4.5 mil, its biggest audience since Nov. 15, 2007.

9 pm
Grey's Anatomy dominated the demos, but at 15.63 million viewers (up 580K) again fell shy of unseating CSI (18.1 mil, down 540 thou) as the hour's most-watched program. With NBC's The Office dropping 10 percent to match its season low (8.35 mil), 30 Rock (eight mil) in turn dipped 530K from its week-ago series high.

With the Denver affiliates factored out, Supernatural actually dipped 330K, to 3.2 mil.

10 pm
Eleventh Hour continued its run at No. 1 with 10.97 million viewers, sliding 500K. Life on Mars stole second with 8.9 mil (up 520 thou), to ER's 8.64 mil.