Horne And Corden attracted 817k (5.7%) for the channel in its 10.30pm slot, making it the highest-rated first episode ever of a comedy on BBC Three.
Elsewhere, the 9pm screening of Heston's Medieval Feast pulled in 2.49m (10.2%) for Channel 4, an increase of 200k on its debut last week. A further 356k (2.2%) watched the show on Channel 4+1.
It was beaten by Five's screening of CSI, which took 3.5m (14.1%). This week's episode - the first to feature Grissom's replacement, Dr Raymond Langston - drew 500k more viewers than the last.
4.1m (16.8%) tuned in to the new episode of Mistresses on BBC One, while BBC Two's Horizon, which examined natural disasters, drew a lowly 1.73m (7.1%).
ITV1 dominated the slot with coverage of Liverpool's game against Real Madrid, which averaged 5.04m (20.9%) between 7.30pm and 10pm.
Holby City was seen by 5.56m (22.8%) on BBC One in the 8pm hour, while Channel 4's Supersize vs Superskinny picked up 2.53m (10.4%).
BBC Two's Coast grabbed 1.89m (7.8%), and Five's Abba's Greatest Secret: Revealed, which looked at the life of Frida Lyngstad, managed just 1.04m (4.3%).
BBC One came out on top in primetime with an average share of 22.8%, just ahead of ITV1's 20.1%. Channel 4 was third with 9.2% (+1: 0.9%), followed by Five with 7.7% and BBC Two with 6.3%.
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Ratings data supplied by Attentional