Torchwood: Miracle Day ended with 3.93m (17.1%) on BBC One in the 9pm hour, down nearly a million viewers on the series premiere in July.
The Doctor Who spinoff was also eclipsed by Billy Connolly's Route 66, featuring the comic travelling down the iconic US highway, which had 5.4m (23.5%) on ITV1 and 281k (1.7%) on +1.
Also finishing on Thursday was The Killing USA, which averaged a modest 980k (4.9%) for Channel 4 between 9pm and 10.55pm, and 118k (0.9%) on +1. Before that, Country House Rescue grabbed 1.43m (6.2%) on the channel and 215k (0.9%) on timeshift.
Back on BBC One, Watchdog was seen by 4.11m (17.8%) in the 8pm hour and Question Time quizzed 2.17m (18.5%) from 10.45pm.
Channel 5's live coverage of Fulham's Europa League clash with Dutch side FC Twente was seen by 1.28m (5.7%) between 7.30pm and 10pm. Afterwards, Big Brother continued with 1.16m (7.4%), and spinoff Big Brother's Bit On The Side entertained 383k (4.5%) from 11pm.
If Walls Could Talk captivated 1.1m (5.4%) on BBC Two in the 7pm hour, before Monty Hall's Great Irish Escape mustered 1.06m (4.6%) from 8pm. How Facebook Changed The World educated 730k (3.2%) in the 9pm slot and Mock The Week amused 1.67m (8.8%) from 10pm.
Overall, ITV1 took primetime with 22.2% (+1: 0.7%) against BBC One's 20.8%. Channel 5 ranked in a strong third with 5.3%, ahead of BBC Two and Channel 4 jointly with 4.8% (+1: 0.7%).
Elsewhere, the new series of Celebrity Juice climbed to an impressive 1.19m (6.6%) on ITV2 from 10pm and 206k (2%) on +1. Supermarket-set comedy Trollied ended with 563k (2.4%) on Sky 1 from 9pm.
On BBC Three, Don't Tell The Bride averaged 549k (2.4%) in the 8pm slot, and new show Young Soldiers captivated 615k (2.7%) from 9pm. Lee Nelson's Well Good Show entertained 530k (3.5%) from 10.30pm.
Comedy The Big Bang Theory mustered 642k (2.9%) on E4 from 8pm and 210k (1.9%) on +1. Live Europa League football pulled in 540k (2.7%) on ITV4 from 5.30pm.
BARB ratings data supplied by Attentional