Robertson then grabbed his second try after being set up by Phil Godman's quick-tap penalty.
Varndell notched the third Wasps try after a good period of pressure, Walder's conversion again wayward.
Adam Larkin replaced the injured Humphreys seconds before Biarritz scored their second try after 63 minutes.
BBC: SPORT | Rugby Union | European Club | Ulster 8-24 Biarritz
But Fionn Carr grabbed a Connacht try after the break although Freddie Pucciariello replied for Munster.
And Brent Sherwin added a further try after the break as Dragons held on.
Queensland made a dream start when Chris Latham scored a stunning solo try after just 21 seconds.
The demoralised Dragons let Catt through for a walk-in try after a neat off-load from Tonga Lea'aetoa.
Bath were awarded a penalty try after Joe Maddock was prevented from scoring by Jason Spice's high tackle.
Replacement Jamie Heaslip's try after the break turned the match and gave Ireland the lead for the first time.
Bridge pounced for his first try after David Hodgson slipped, deceived by a wicked bounce from Lee Briers' kick.
Hodgson kicked his second penalty and converted Lund's controversial try after Northampton's Andrew Blowers appeared to be tackled early.
Centre Jamie Roberts scored the crucial try after 50 minutes that, with Ben Blair's conversion, levelled the scores at 13-13.
Ulster hit back two minutes later when McCullough went over for a converted try after a break from Andrew Trimble.
Their attacking intent was obvious from the start, Aled Brew sent in for a try after a clinical three-quarter move.
Ryan Hudson extended the home side's lead with a try after the break, but Catalans hit back with David Ferriol.
Jones-Buchanan crashed over for a Leeds try after just seven minutes and Peacock romped over soon after, Kevin Sinfield converting both.
From the resulting attack, Slater beat two defenders to collect Thurston's cross-field kick for the third try after just nine minutes.
The visitors started strongly and grabbed the opening try after full-back Adam Ashley-Cooper barged through a tackle from a rusty McCaw.
Bristol started brightly, with only an unfortunately timed knock-on by David Lemi preventing them claiming the opening try after 15 minutes.
Tommy Bowe scored the only Irish try after collecting an Isaac Boss offload, while Andrew Dunne claimed eight points with the boot.
Within a minute, a bonus-point had even disappeared for the stunned French side as Ronan notched another try after his own chip-and-chase.
The fifth Gloucester try after 28 minutes came from a turnover with Balshaw storming away from the chasing Isaac Boss to go over.
Phelps was outjumped by Wigan second rower Hoffman, who collected Deacon's towering kick to score the game's first try after just three minutes.
He attended high school in New Hampshire, where he gave competitive running a try after years of "running away from conflict, " he said.
Sexton's crucial try after 51 minutes gave the visitors an 11-point lead in what was a closely fought Pool Two clash at Wembley.
Selley grabbed his second try after the break and Mark Lewis added the fifth late on, both converted by the excellent Nick Robinson.
Cudjoe added the conversion and then went over in the corner for the second try after being fed by 18-year-old debutant full-back Elliott Hodgson.
Britz scored his second try after the break and although Leicester rallied to 23-20 through Scott Hamilton's try, a fourth Carter penalty sealed victory.
Ulster clinched the bonus point six minutes after the restart when Court struck from close range for a converted try after an impressive drive.
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