The popular US drama took 613k (2.8%) on E4 and an additional 135k (0.8%) on timeshift.
It also boosted Made in Chelsea's numbers - the reality show improved to 635k (3.6%) from 10pm and 143k (1.5%) on +1 and helped E4 top the multichannels overall.
On the terrestrials, Chatsworth drew 3.78m (17.2%) on BBC One in the 9pm hour but was narrowly beaten live by ITV1's 56 Up, which had 3.85m (17.5%) as well as a further 243k (1.4%) on timeshift.
BBC Two showed Springwatch (2.22m/10.2%), Afghanistan: The Great Game (1.03m/4.7%) and Sounds of the '70s (621k/3.2%).
Dispatches drew 834k on Channel 4 from 8pm (+1: 122k/0.6%) before Gok Cooks Chinese served 947k (4.2%) from 8.30pm (+1: 157k/0.7%). The Secret Millionaire had 1.56m (7.1%) from 9pm (+1: 189k/1.1%).
The Walking Dead continued with 815k for Channel 5, with The Gadget Show: World Tour and Robson's Extreme Fishing Challenge taking 686k (3.2%) and 1.02m (4.6%) respectively.
Overall, ITV1 secured primetime victory with 21.8% (+1: 0.7%), beating BBC One's 20.4%. BBC Two came third with 6.4% ahead of Channel 4's 4.8% (+1: 0.7%) and Channel 5's 3.9% (+1: 0.2%).
BARB ratings data supplied by Attentional