Catalans Dragons will get back on the plane over to north west England one more time as they head to Old Trafford on 14 October.
Sam Tomkins' solo score in the last minute ensures that he gets one final crack at landing the Super League crown.
He said that he wants a shot at his old club, Wigan Warriors, in the Grand Final.
We will be back tomorrow lunchtime to see if his wish comes true when Wigan play Hull KR at the DW Stadium.
Thanks for your company this evening and as Catalans celebrate, it's au revoir et bonne nuit!
'A defeat that is tough to take'
FT: Catalans Dragons 12-6 St Helens
St Helens head coach Paul Wellens told Sky Sports:
"There's a lot of emotions going on right now. We came here confident we could get a result.
"At some point this run was going to end and we hoped it wasn't tonight. If it was going to end, like tonight, a group of men dying for each other is the way to end it.
"Right now it is tough to take.
"It's been a challenging year. It started off unbelievably well down in Australia and we had our tough periods but this team stuck together.
"I've always been associated with this club and I'm immensely proud to be associated with this group of players.
"Professionally, sport at the top end is about high margins. We gave absolutely everything and as a coach right now I couldn't have asked for any more."
Someone has to break Grand Final monopoly - McNamara
FT: Catalans Dragons 12-6 St Helens
SWPix.comCopyright: SWPix.com
Catalans Dragons boss Steve McNamara told Sky Sports:
"What a game. What a hard game. There was nothing in it with both teams. It was such a hard game.
"We dropped our intensity at the start of the second half and let Saints back in it. We'd practised scenarios like this for the past few weeks and it was an incredible effort from them.
"It was a shame for both teams. They must be distraught. St Helens are a champion team. But we found a way. We've improved so many things at our club and team in the past two years.
"I wasn't quite so sure with 15 minutes to go, but we're there and now we're going to compete to win a Grand Final.
"It's been monopolised by four teams, if you include Bradford. Someone's got to break that dominance. We'll get another chance in eight days' time."
End of the line for Roby
Catalans Dragons 12-6 St Helens
For 79 minutes, St Helens defended superbly keeping their tryline unbroken.
But for a moment of magic from Sam Tomkins, they would be heading into extra-time with a shot at making it to Old Trafford.
They're not and that is how the story ends for skipper James Roby.
There will be no fifth straight Super League crown for him or for the Saints.
Winning is unbelievable - Tomkins
FT: Catalans Dragons 12-6 St Helens
SWPix.comCopyright: SWPix.com
Catalans Dragons full-back Sam Tomkins told Sky Sports:
"What an ending. It was a tough game and what you expect against a quality side but the determination we showed and intent in our defence was remarkable at times.
"It was hot and sweaty and people had bumps and bruises but we got there in the end.
"When they went down to 12 men I knew there'd be space somewhere and I could step in on my good leg and find a way through.
"The games that you win like this, this is why we play. You play to be on the big stage. You've got to have winners and losers but winning is unbelievable.
"Just before I left the changing rooms, the last thing Steve said to me was 'think about what we spoke about when we signed you, you can be part of the first team to win a Grand Final at the club.'
"I'm glad I've given us a chance in my last home game."
'Catalans got there in the end'
FT: Catalans Dragons 12-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
Catalans managed to weather that storm for 20, 25 minutes when St Helens moved through the gears in the second half.
They got back into it with kicks and creeping back into it and they got there in the end.
Party in Perpignan
FT: Catalans Dragons 12-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
What a party these Catalans fans are going to have tonight.
BreakingCATALANS DRAGONS REACH THE SUPER LEAGUE GRAND FINAL
Catalans Dragons 12-6 St Helens
Catalans Dragons are heading to Old Trafford. St Helens' reign as Super League champions is over.
Sam Tomkins career is extended by a further week. The retiring James Roby and Louie McCarthy-Scarsbrook bow out after defeat in a bruising encounter in Perpignan.
CONVERTED TRY Catalans Dragons 12-6 St Helens
Adam Keighran
Game over! Adam Keighran adds the two with the last kick of the night.
TRY Catalans Dragons 10-6 St Helens
Sam Tomkins
Sam Tomkins wins the game for Catalans Dragons!!!!
What a piece of play from this Super League legend! He goes for the drop goal, but sees the rush defence, dummies and then beats at least three defenders before diving under the posts.
Sheer, sheer class from Tomkins.
Post update
Catalans Dragons 6-6 St Helens
Sam Tomkins tries a drop goal, but it's blocked and it doesn't even reach the line.
St Helens have the ball. But Mark Percival knocks it on! We have a scrum.
Post update
Catalans Dragons 6-6 St Helens
Close!
A wonderful grubber kick from Sam Tomkins and Tommy Makinson makes a desperate stretch to punch the ball behind.
They will have to kick the ball back to the Dragons.
Post update
Catalans Dragons 6-6 St Helens
Saints will have to dig really deep now with a man down and more defending to do.
'Drop goal territory'
Catalans Dragons 6-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
That has woken the Catalans fans up!
With seven minutes to go, we're now in drop goal territory.
PENALTY Catalans Dragons 6-6 St Helens
Adam Keighran
Three out of three!
Adam Keighran's boot brings us level!!
SIN-BIN - Matty Lees
Catalans Dragons 4-6 St Helens
Big moment!
Matty Lees is shown a yellow card as he refuses to let Tom Johnstone get off the ground in the tackle as Catalans had regained the ball after Saints had knocked on a Mitchell Pearce up-and-under.
St Helens will play up to the hooter with only 12 men.
Post update
Catalans Dragons 4-6 St Helens
SWPix.comCopyright: SWPix.com
Some superb defending from St Helens, notably a superb one-on-one tackle from Tommy Makinson on Sam Tomkins.
Another Catalans attack repelled.
Post update
Catalans Dragons 4-6 St Helens
The players come together after the whistle goes for a high tackle on Adam Keighran by young George Delaney.
They have kept referee Chris Kendall busy tonight!
'Dragons needed that'
Catalans Dragons 4-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
Catalans were getting a bit fatigued and were looking a bit loose, so they needed that.
Now it's all about field position and territory for both sides.
PENALTY Catalans Dragons 4-6 St Helens
Adam Keighran
Adam Keighran does the business with the boot and the deficit is just two points now.
Live Reporting
Adam Lanigan
All times stated are UK
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SWPix.comCopyright: SWPix.com 
SWPix.comCopyright: SWPix.com 
SWPix.comCopyright: SWPix.com 
Latest PostWill Super Sam get his dream showdown?
FT: Catalans Dragons 12-6 St Helens
Catalans Dragons will get back on the plane over to north west England one more time as they head to Old Trafford on 14 October.
Sam Tomkins' solo score in the last minute ensures that he gets one final crack at landing the Super League crown.
He said that he wants a shot at his old club, Wigan Warriors, in the Grand Final.
We will be back tomorrow lunchtime to see if his wish comes true when Wigan play Hull KR at the DW Stadium.
Thanks for your company this evening and as Catalans celebrate, it's au revoir et bonne nuit!
'A defeat that is tough to take'
FT: Catalans Dragons 12-6 St Helens
St Helens head coach Paul Wellens told Sky Sports:
"There's a lot of emotions going on right now. We came here confident we could get a result.
"At some point this run was going to end and we hoped it wasn't tonight. If it was going to end, like tonight, a group of men dying for each other is the way to end it.
"Right now it is tough to take.
"It's been a challenging year. It started off unbelievably well down in Australia and we had our tough periods but this team stuck together.
"I've always been associated with this club and I'm immensely proud to be associated with this group of players.
"Professionally, sport at the top end is about high margins. We gave absolutely everything and as a coach right now I couldn't have asked for any more."
Someone has to break Grand Final monopoly - McNamara
FT: Catalans Dragons 12-6 St Helens
Catalans Dragons boss Steve McNamara told Sky Sports:
"What a game. What a hard game. There was nothing in it with both teams. It was such a hard game.
"We dropped our intensity at the start of the second half and let Saints back in it. We'd practised scenarios like this for the past few weeks and it was an incredible effort from them.
"It was a shame for both teams. They must be distraught. St Helens are a champion team. But we found a way. We've improved so many things at our club and team in the past two years.
"I wasn't quite so sure with 15 minutes to go, but we're there and now we're going to compete to win a Grand Final.
"It's been monopolised by four teams, if you include Bradford. Someone's got to break that dominance. We'll get another chance in eight days' time."
End of the line for Roby
Catalans Dragons 12-6 St Helens
For 79 minutes, St Helens defended superbly keeping their tryline unbroken.
But for a moment of magic from Sam Tomkins, they would be heading into extra-time with a shot at making it to Old Trafford.
They're not and that is how the story ends for skipper James Roby.
There will be no fifth straight Super League crown for him or for the Saints.
Winning is unbelievable - Tomkins
FT: Catalans Dragons 12-6 St Helens
Catalans Dragons full-back Sam Tomkins told Sky Sports:
"What an ending. It was a tough game and what you expect against a quality side but the determination we showed and intent in our defence was remarkable at times.
"It was hot and sweaty and people had bumps and bruises but we got there in the end.
"When they went down to 12 men I knew there'd be space somewhere and I could step in on my good leg and find a way through.
"The games that you win like this, this is why we play. You play to be on the big stage. You've got to have winners and losers but winning is unbelievable.
"Just before I left the changing rooms, the last thing Steve said to me was 'think about what we spoke about when we signed you, you can be part of the first team to win a Grand Final at the club.'
"I'm glad I've given us a chance in my last home game."
'Catalans got there in the end'
FT: Catalans Dragons 12-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
Catalans managed to weather that storm for 20, 25 minutes when St Helens moved through the gears in the second half.
They got back into it with kicks and creeping back into it and they got there in the end.
Party in Perpignan
FT: Catalans Dragons 12-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
What a party these Catalans fans are going to have tonight.
BreakingCATALANS DRAGONS REACH THE SUPER LEAGUE GRAND FINAL
Catalans Dragons 12-6 St Helens
Catalans Dragons are heading to Old Trafford. St Helens' reign as Super League champions is over.
Sam Tomkins career is extended by a further week. The retiring James Roby and Louie McCarthy-Scarsbrook bow out after defeat in a bruising encounter in Perpignan.
CONVERTED TRY Catalans Dragons 12-6 St Helens
Adam Keighran
Game over! Adam Keighran adds the two with the last kick of the night.
TRY Catalans Dragons 10-6 St Helens
Sam Tomkins
Sam Tomkins wins the game for Catalans Dragons!!!!
What a piece of play from this Super League legend! He goes for the drop goal, but sees the rush defence, dummies and then beats at least three defenders before diving under the posts.
Sheer, sheer class from Tomkins.
Post update
Catalans Dragons 6-6 St Helens
Sam Tomkins tries a drop goal, but it's blocked and it doesn't even reach the line.
St Helens have the ball. But Mark Percival knocks it on! We have a scrum.
Post update
Catalans Dragons 6-6 St Helens
Close!
A wonderful grubber kick from Sam Tomkins and Tommy Makinson makes a desperate stretch to punch the ball behind.
They will have to kick the ball back to the Dragons.
Post update
Catalans Dragons 6-6 St Helens
Saints will have to dig really deep now with a man down and more defending to do.
'Drop goal territory'
Catalans Dragons 6-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
That has woken the Catalans fans up!
With seven minutes to go, we're now in drop goal territory.
PENALTY Catalans Dragons 6-6 St Helens
Adam Keighran
Three out of three!
Adam Keighran's boot brings us level!!
SIN-BIN - Matty Lees
Catalans Dragons 4-6 St Helens
Big moment!
Matty Lees is shown a yellow card as he refuses to let Tom Johnstone get off the ground in the tackle as Catalans had regained the ball after Saints had knocked on a Mitchell Pearce up-and-under.
St Helens will play up to the hooter with only 12 men.
Post update
Catalans Dragons 4-6 St Helens
Some superb defending from St Helens, notably a superb one-on-one tackle from Tommy Makinson on Sam Tomkins.
Another Catalans attack repelled.
Post update
Catalans Dragons 4-6 St Helens
The players come together after the whistle goes for a high tackle on Adam Keighran by young George Delaney.
They have kept referee Chris Kendall busy tonight!
'Dragons needed that'
Catalans Dragons 4-6 St Helens
Paul Rowley
Salford Red Devils head coach on BBC Radio 5 Live Sports Extra
Catalans were getting a bit fatigued and were looking a bit loose, so they needed that.
Now it's all about field position and territory for both sides.
PENALTY Catalans Dragons 4-6 St Helens
Adam Keighran
Adam Keighran does the business with the boot and the deficit is just two points now.