The Kiefer Sutherland drama picked up 606k (2.6%) in the 8pm timeslot, improving on last week's numbers.
On Sky Atlantic, the latest Mad Men episode took 47k (0.2%) from 9pm. Earlier, Friday Night Lights managed 21k (0.1%).
The Vampire Diaries rose to 407k (1.7%) on ITV2, while Alcatraz also improved, averaging 459k (2%) in the same 9pm hour on Watch.
On the terrestrials, The Syndicate dominated for BBC One with 5.44m (23.1%). Smugglers could only respond with 2.9m (12.3%) on ITV1 (+1: 370k/2.1%), with a celebrity special of Who Wants to Be a Millionaire? taking 2.54m (11%) earlier (+1: 127k/0.5%).
BBC Two showed Hairy Bikers' Bakeation (2.86m/12.3%) and Horizon (1.26m/5.4%).
Channel 4's Supersize v Superskinny was seen by 1.93m (8.3%) from 8pm and a further 219k (0.9%) on timeshift. New series The Undateables strongly launched to 2.35m (10%) afterwards with 557k on +1.
Lastly, CSI pulled in 1.87m (7.9%) on Channel 5 (+1: 124k/0.7%) with Rory McGrath's Pub Dig averaging 726k (3.1%).
Overall, BBC One comfortably won primetime with 23.7% ahead of ITV1's 13.2% (+1: 0.8%). BBC Two came third with 8% beating Channel 4's 6.6% (+1: 1.3%) and Channel 5's 4.9% (+1: 0.2%).
BARB ratings data supplied by Attentional