The Chris Tarrant-hosted quiz show also attracted an additional 180k (0.7%) on +1.
River Monsters preceded it with 2.86m (11.4%) from 7.30pm (+1: 124k/0.5%), while The Biggest Loser ended up with 2.8m (11.2%) from 9pm (+1: 165k/0.9%).
The 9pm timeslot saw a late change on BBC One, as a Panorama instalment on Stephen Lawrence replaced Anna Friel's Public Enemies. Panorama was watched by 2.62m (10.5%).
Elsewhere on the channel, Celebrity Mastermind quizzed 5.23m (22%) from 7pm, Holby City treated 5.44m (21.2%) from 8pm and Lee Mack Going Out Live had 2.02m (15.3%).
Hairy Bikers' Best of British began BBC Two's night with 2.04m (8.4%). Nature's Weirdest Events and King George and Queen Mary: The Royals Who Rescued the Monarchy followed with 3.83m (14.9%) and 3.38m (13.6%) respectively.
Have I Got Old News for You took 1.7m (8%) from 10pm.
Channel 4's The Fat Fighters was seen by 1.03m (4%) from 8pm (+1: 133k/0.5%). Later that night, 2.18m (8.7%) tuned in for Accused: The 74-Stone Babysitter (+1: 332k/1.8%) and 1.13m (6.1%) saw The Bank Job from 10pm (+1: 125k/1.2%).
Channel 5 had a lineup of Charley Boorman's Extreme Frontiers (511k/2.1%), Cowboy Builders (1.21m/4.7%) and XIII: The Conspiracy (1.07m/5.5%).
Overall, BBC One won primetime with 20.8% ahead of ITV1, which had 13.7% (+1: 0.5%). BBC Two followed with 11.3%. Channel 4 took 5.6% (+1: 0.8%), while Channel 5 ended with 4.2%.
On ITV2, two episodes of Benidorm from 9pm and 9.30pm drew 681k (2.7%) and 745k (3%) respectively.
BARB ratings data supplied by Attentional