In a thrilling final at Suncorp Stadium, the sides were locked at 13-13 with just 12 minutes to play when the Australia scrum-half received the ball 10 yards inside his own half following a turnover. He initially appeared to be boxed in by defenders but quick footwork saw him break free into Crusaders' territory.
Genia still had plenty of work to do but a dummy to his outside support as they reached the 22 gave him just enough room and momentum to slide over the line.
The Crusaders, the most successful side in the competition's history, launched a series of desperate late attacks, but it was not enough as their Brisbane-based opponents closed out the victory.
The Crusaders had led 7-6 at the break thanks to a fantastic converted try by Daniel Carter, Quade Cooper responding with two penalties for the Reds.
Carter kicked two penalties of his own after the break but Digby Ioane's spectacular try levelled the scores, before Genia struck the decisive blow.
Many had predicted an exciting contest between the tournament's leading scorers and the opening exchanges were played out at a frenetic pace.
Ioane could have given the hosts an early try but he failed to gather a well-placed Cooper chip, while the Crusaders launched two bright counter-attacks in a breathless start.
The New Zealand side were the quicker of the teams to settle, retaining possession through the phases and putting pressure on the Reds defence, but their gathering momentum was halted by two not-straight line-out throws from hooker Corey Flynn.
The normally metronomic Carter missed a penalty chance to give the visitors the lead, and opposite number Cooper punished him by nailing his first effort on the half-hour mark for a 3-0 lead.
But All Blacks star Carter hit back by crafting the opening try with a moment of genius.
The fly-half had few options when he received the ball going right but his delicate grubber turned the defence and he raced through to re-gather and dot down before adding the extras.
Cooper kept the Reds in close company at the break by slotting his second three-pointer two minutes prior to the break.
The Crusaders should have extended their lead within seconds of the resumption as Sonny Bill Williams' pass sent centre partner Robbie Fruean clear, but his inside pass was juggled and put down by Sean Maitland with a clear run to the line beckoning.
Carter knocked over a penalty to establish a four-point lead at 10-6, but the Reds struck back through Ioane.
The powerful winger turned on the gas to outpace Williams on halfway and his left-foot step left full-back Tom Marshall clutching at thin air as he charged over. Cooper kicked the conversion to make it 13-10 in the hosts favour.
The lead did not last long as Carter held his nerve to slot a long-distance penalty shot, but Genia had the last word with his wonderful clinching score.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
$29.99
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.