Lee Mack's All Star Cast, featuring guests Frank Skinner, Fern Britton, Tess Daly and James Blunt, averaged 4.19m (20.8%) for BBC One from 9.45pm.
Also premiering on Saturday was The Marriage Ref, but the Dermot O'Leary-fronted panel show limped in with a disappointing 2.25m (10.5%) in the 9pm hour and 203k (1.1%) on ITV1+1.
Earlier on ITV1, Odd One In mustered 3.45m (17.6%) from 7.15pm, before Penn and Teller: Fool Us tricked 3.93m (18.8%) in the 8pm hour and 303k (1.4%) on timeshift.
The National Lottery: Who Dares Wins entertained 4.87m (23.4%) on BBC One in the 8pm hour, and then Casualty healed 4.98m (22.9%) from 9pm. Michael McIntyre's Comedy Roadshow amused 2.95m (19.5%) from 10.45pm.
Over at BBC Two, Flog It and Dad's Army picked up 1.65m (8.9%) and 2.42m (12.1%) in the 7pm hour. Kennedy's Home Movies captivated 1.87m (8.9%) in the 8pm hour and Have I Got A Bit More News For You tickled 2.13m (9.8%) from 9pm. A Culture Show Special rounded out the evening with 770k (4%) from 9.45pm.
A screening of Mean Girls appealed to 1.05m (5.2%) on Channel 4 from 7pm and 223k (1%) on +1. Big budget drama Camelot continued with 1.64m (7.7%) from 9pm and 230k (1.3%) on timeshift.
Cricket highlights scooped 767k (4%) on Channel 5 in the 7pm hour, before NCIS attracted 773k (3.7%). CSI: NY and Law & Order: SVU drew 939k (4.4%) and 1.29m (7%) respectively from 9pm.
Overall, BBC One owned primetime with 23% against ITV1's 14.2% (+1: 0.9%). BBC Two came in third with 8%, ahead of Channel 4's 5.6% (+1: 1%) and Channel 5's 4.7%.
BARB ratings data supplied by Attentional