The Showtime thriller, starring Damian Lewis and Claire Danes, took 2.05m (7.8%) in the 9pm hour and a further 314k (1.6%) on Channel 4 +1.
Bucking the trend against Channel 4's recent US imports, the ratings were exactly 100k higher than last week.
Sister channel E4's 10pm showing of Desperate Housewives managed a decent 637k (3.3%), then 161k (1.6%) caught up an hour later.
The Only Way Is Essex triumphed with 1.04m (5.1%) and 125k (1.1%) on +1, while a repeat of Friday's Benidorm amused 879k (3.3%) at 9pm (+1: 165k/0.9%), and movie The Mummy Returns grabbed 701k (2.2%) from 6.30pm (+1: 176k/0.7%).
BBC Three's Being Human lagged behind with 680k (2.6%), and Sky1's Got to Dance had 548k (2.3%) from 6pm.
Back on the terrestrials, Dancing on Ice's performance show benefited from a shorter running time, drawing 7.35m (27.8%) from 7pm (+1: 260k/0.9%).
BBC One's Upstairs Downstairs fell to 5.85m (22.4%) from 9.05pm, prior to which Countryfile (7.35pm) interested 6.4m (23.5%) and Antiques Roadshow (8.20pm) pulled in 6.36m (22.7%).
Meanwhile, Top Gear was easily BBC Two's most-watched programme with 5.17m (18.8%) at 8pm. Swimming with Crocodiles (2.16m/8.2%) and Match of the Day 2 (2.45m/13.8%) followed with respectable audiences.
For Channel 5, Cowboy Builders (626k/2.2%) and The Outlaw of Josey Wales (746k/3.8%) both underperformed.
Elsewhere, The Hotel welcomed 1.22m (4.3%) to Channel 4 at 8pm (+1: 191k/0.7%), while late-night film Law Abiding Citizen also performed well with 1.49m (10.4%) and 289k (3.9%) on timeshift.
Overall, ITV1 just overtook BBC One in primetime with 22.4% (+1: 0.9%) against 22.2%. BBC Two finished in third place with 10.9%, way ahead of Channel 4's 5.4% (+1: 0.7%).
Surprisingly, ITV2 edged into fifth place with 3.3% (+1: 0.7%), beating Channel 5's 3.1%.
BARB ratings data supplied by Attentional