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'It's the craziest game I've ever been a part of,' said breathless Harlequins full-back Tyrone Green after helping his side complete the greatest comeback in Premiership history.

The South African was summing it all up for everyone lucky enough to witness it.

Happy Harlequins hoping to secure tickets to their first league final since 2012 will be rubbing their eyes in disbelief on Monday morning.

Exeter - back at Twickenham for the sixth year in a row - might be a frightening prospect, but does a team really know fear after that?

Harlequins full-back Tyrone Green (centre) admitted their comeback win over Bristol was 'one of the craziest games I've been part of'

For those with sore heads and bleary eyes across south London and beyond today it is worth re-running the most extraordinary rugby match many have ever seen.

Ashton Gate was a cider-swelling mess of celebration when 29 minutes in Bristol were but a speck on the horizon for Quins, 28-0 ahead having scored four wonderful tries and two penalties.

Charles Piutau was doing whatever he pleased, tearing Harlequins to ribbons.

Max Malins had two tries and Ben Earl one - and when Luke Morahan span through a hapless tackle on the right wing after Semi Radradra had sped away quicker than his blacked-out Ford Mustang parked by the stadium entrance this game was over.

The Quins were delirious at the final whistle after sealing a remarkable victory in extra time  

Quins coach Billy Millard had led a half time inquest to help get them back in the game

For Pat Lam, the Bristol boss, there were tiny pointers of negativity though.

'Alarm bells were going just before half-time,' he said after.

Marcus Smith put up a high kick, Malins dropped it, Alex Dombrandt scooped up and ran in.

Nice for Quins to take a try home, the sages patronised as the visitors plotted.

'Our captain Stephan Lewies spoke, Joe Marler spoke, we split them into their units and I said a couple of bits,' said Quins' general manager Billy Millard about the half-time inquest.

'Boys weren't worried too much,' added Green.

Lam said: 'We said, what would we do if we were 28-5 down? We'd be all-out attack.' With Piutau off with a head injury, the Quins resurgence started. Danny Care sped into the second-half, tapping a quick penalty and finding Green on a hard line. 28-12.

Perhaps seduced by their Harlem Globetrotter-style start, Bristol kept playing - but now made mistakes.

Quins prop Wilco Louw made an incredible try-saving tackle on Morahan and later a fumble in Bristol's 22 saw James Chisholm gobble up and score. 28-19.

Dombrandt then raced right through Bears' middle from a lineout, before Louis Lynagh slid in to make it 28-24 55 minutes in.

Green himself helped spark the comeback, scoring two tries to set up a tense finale 

As the game slowed and bodies tired Callum Sheedy hit a penalty, meaning Quins had to score a fifth and convert to draw.

Harry Randall and Lynagh had tries denied for forward passes - 'if we scored that, that would have put it away,' said Lam of Randall's - but when Smith and Green combined to send Joe Marchant away, the fly-half kicked the scores level so we entered the first ever extra-time period in a playoff semi-final.

'We were hanging on there, a few niggles and injuries,' added Lam.

Sheedy agonisingly hit a post with a long penalty. Joe Marler won scrums until the 95th minute, one wheeling perfectly to allow Green space on the right, stepping Radradra to edge Quins ahead.

Bristol star Max Malins scored a hat-trick but it barely registered as Quins sealed a famous win

Harlequins players were in high spirits after the game after achieving Mission Impossible

Malins' hat-trick - the third scored in Premiership semi - barely registered as now a draw meant Quins were through having scored six tries to Bristol's five.

There was still time for more - Marchant in for Quins' seventh with Bristol down to 13 due to injuries, Wayne Barnes controversially deciding not to send off Luke Northmore for a tackle in the build-up, Smith then grinning as he missed the conversion 110 minutes into this bonkers game.

The 500 Harlequin fans amid the 6,606 in went potty, players collapsed and the head-coach-less Quins had achieved mission impossible.

'You don't dream that,' was all Millard, who had paced the changing-rooms during extra-time, could say.

'That's footie, you know.'