Hidden, starring Philip Glenister as down-on-his luck solicitor Harry Venn, was seen by 5.22m (22.2%) on BBC One in the 9pm slot.
The conspiracy thriller proved too strong for Billy Connolly's Route 66, which continued with 4.27m (18.1%) on ITV1 in the 9pm hour and 287k (1.6%) on +1.
Elsewhere on BBC One, Watchdog was seen by 4.3m (18.5%) in the 8pm hour and Question Time quizzed 2.33m (19.1%) from 10.45pm.
Over at the multi-channels, Sky1's Glee stayed tuneful with 502k (2.1%) in the 9pm hour. Afterwards, the new series of Hugh Laurie's House premiered with 284k (1.6%).
The X Factor USA entertained 827k (3.5%) from 8pm, along with 191k (0.9%) on +1. Comedy panel show Celebrity Juice amused 1.17m (6.1%) from 10pm and 210k (2.1%) on timeshift.
Back on the terrestrials, Country House Rescue had 1.11m (4.8%) on Channel 4 in the 8pm slot and 199k (0.8%) on +1. Educating Essex educated 1.56m (6.6%) and 186k (1%) on timeshift. Ramsey's Kitchen Nightmares served up 950k (5.4%) from 10pm, and 126k (1.4%) on +1.
If Walls Could Talk captivated 1.29m (6.1%) on BBC Two in the 7pm hour, before The Great British Bakeoff Masterclass delighted 2.09m (9%) from 8pm and Mixed Britannia took 1.15m (4.9%) from 9pm. Mock The Week amused 1.9m (9.5%) from 10pm.
Channel 5's How Do They Do It? mustered 529k (2.4%) from 7.30pm, before How To Build... grabbed 426k (1.8%) in the 8pm slot. Extraordinary People fetched 1.55m (6.6%) from 9pm.
Afterwards, Big Brother entertained 1.42m (8%) from 10pm and spinoff Big Brother's Bit On The Side had 544k (5.7%) from 11pm.
Overall, BBC One edged primetime with 22.4% against BBC One's 20.6% (+1: 0.8%). BBC Two ranked in third with 6.7%, ahead of Channel 4 with 5% (+1: 0.7%) and Channel 5 with 4.3%.
Elsewhere, EastEnders: The New Moons delighted 357k (1.5%) on BBC Three from 8pm, Young Soldiers captivated 477k (2%) from 9pm and Lee Nelson's Well Good Show entertained 491k (3.3%) from 10.30pm.
Shock and Awe: The Story of Electricity electrified 477k (2%) on BBC Four in the 9pm slot.
BARB ratings data supplied by Attentional