Hosted by Chris Evans and featuring celebrities such as Ricky Gervais, Gordon Ramsay and Teri Hatcher competing in extreme sports events, Famous And Fearless averaged 2.09m (8%) on Channel 4 between 8pm and 10pm. A further 336k (1.4%) caught the show on timeshift.
On BBC One, new detective series Zen grabbed 5.11m (20%) between 9pm and 10.30pm, beating Agatha Christie's Marple, which had 4.3m (17.4%) on ITV1 from 9pm.
Earlier on BBC One, Countryfile brought in 6.25m (26%) from 6.15pm and Antiques Roadshow managed 6.75m (25.5%) from 7.15pm. Casualty entertained 6.15m (23.2%) from 8.15pm.
A screening of The Incredible Hulk brought in 2.67m (12.2%) on ITV between 5pm and 7pm. Primeval fetched 3.29m (12.7%) in the 7pm hour, before The Cube: Celebrity Special mustered 3.94m (14.8%) in the 8pm hour.
Over at BBC Two, coverage of the BDO World Darts Championship took 1.16m (5.2%) between 5.30pm and 6.45pm, and then The Morecambe And Wise Christmas Special 1977 amused 2.34m (9%). Oz and Hugh Raise The Bar had 2.05m (7.7%) in the 9pm hour, before Arctic With Bruce Parry debuted with 2.79m (10.7%). Match Of The Day 2 had 2.7m (11.6%) from 10pm.
A screening of Iron Man pulled in 2.96m (12.1%) on Channel 4 between 5.45pm and 8pm, while 561k (2.2%) watched the film on timeshift. Alan Carr: Chatty Man fetched 1.31m (5.7%) from 10pm and 214k (1.5%) on +1.
Channel 5's screening of The Towering Inferno entertained 765k (3%) between 6pm and 9pm. It was followed by Most Shocking Celebrity Moments 2010, which grabbed 923k (4.3%).
Overall, BBC One won primetime with 21.8% against ITV1's 15.5%. BBC Two came in third with 9.8%, followed by Channel 4 with 8.6% (+1: 1.9%) and Channel 5 with 3.4%.
Elsewhere, Sky1's talent show Got To Dance returned with healthy consecutive audiences of 853k (3.6%) and 1.13m (4.3%) between 6pm and 8pm.
BARB ratings data supplied by Attentional