Sheffield Wednesday will play either Bolton or Barnsley at Wembley on 29 May after amazing semi-final win
Owls won shootout 5-3, with Posh's Dan Butler hitting the bar with his effort
Wednesday won second leg 4-0 after 90 minutes and 5-1 after extra time to send tie to penalties
No team had ever overturned a four-goal first-leg deficit to win a play-off semi-final tie
Sheff Wed 4-1 Peterborough (agg 4-5)
Francis Green
Ex-Peterborough forward on BBC Radio Cambridgeshire
Well there's the half a chance Posh needed, though everyone needs to be calm, because this is far from over. Far from over.
They need to fully switch on now.
Posh haven't had a decent chance in the whole game, but they earned a half-chance, and took it.
Lee Gregory own goal
Peterborough hit back!
Lee Gregory tries his best to defend a Peterborough free-kick but heads into his own net amid pressure from Nathan Thompson.
Another twist in this play-off and Sheffield Wednesday will have to battle back again if they are to avoid their season ending.
Sheff Wed 4-0 Peterborough (agg 4-4)
Jonson Clarke-Harris sends in a low drive to the Sheffield Wednesday box.
Aden Flint clears.
Needless to say, this is very tense.
Sheff Wed 4-0 Peterborough (agg 4-4)
An extra time Sheffield Wednesday change.
Marvin Johnson comes off.
Jaden Brown is on.
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Steve: This is why we love football.
Nicholas: This is a whole new level of Spursy, even from a Tottenham fan.
Matt: To paraphrase the late, great Eddie Butler: Peterborough, what have you done, and Wednesday, what are you doing?
Sheff Wed 4-0 Peterborough (agg 4-4)
Michael Ihiekwe is booked as the Sheffield Wednesday man puts in a high boot on Peterborough substitute Ricky-Jade Jones.
The visiiors win a free-kick in a dangerous area which is immediately headed clear.
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Darren: Wednesday score in the eighth minute of six added on minutes, how does that work?
Al: Where did all that extra time come from?! Come on Peterborough.
The six minutes indicated are of course just a minimum. We'll never know but I think if Jonson Clarke-Harris had got the ball clear moments before the ball was recycled for Liam Palmer to score, the referee would have blown for time. The barest of margins.
Keep your thoughts coming using #bbcefl on Twitter.
Sheff Wed 4-0 Peterborough (agg 4-4)
For the first time in quite some time, Peterborough have strung together a spell of possession.
It doesn't last long as Barry Bannan wins the ball back for the hosts.
Some tired legs out there by now I bet.
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Image source, Rex FeaturesNicholas: I'm trying to explain to my American cousin sat next to me that this isn't the norm. Not quite sure how Sheffield Wednesday have managed that.
Richard: Wow! What a game!
Greg: Wednesday have had 48 attempts to Posh’s 18 over the two legs. 48!! They more than deserve the extra time.
All the pressure eventually told for Sheffield Wednesday when Liam Palmer equalised with the final kick of the 90 minutes.
Send your thoughts on this crazy play-off semi-final using #bbcefl on Twitter.
Sheff Wed 4-0 Peterborough (agg 4-4)
Francis Green
Ex-Peterborough forward on BBC Radio Cambridgeshire
Nothing surprises me in this game, but I honestly don't know what to say.
I've seen it so many times, a team getting there with the last kick of the game.
I thought the Owls had burned themselves out.
You want Wednesday to suddenly think the job's done, that's how Peterborough can get back into it.
Sheff Wed 4-0 Peterborough (agg 4-4)
Another Peterborough substitution.
Hector Kyprianou comes off, Ricky-Jade Jones replaces him.
Sheff Wed 4-0 Peterborough (agg 4-4)
A long Will Vaulks throw-in goes into the Peterborough box.
As ever, Peterborough initially deal with the danger before Michael Smith's shot draws a save from Will Norris.
Sheff Wed 4-0 Peterborough (agg 4-4)
Right. You ready?
We're back under way for extra time at Hillsborough.
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Adam: Fergie-time doesn’t quite work for Posh's Darren.
David: Absolutely mental, what a game.
Michael: If Wednesday do this, surely it will be one of, if not the greatest comeback in a play-off.
FT: Sheff Wed 4-0 Peterborough (agg 4-4) - extra time to follow
Brian Laws
Ex-Sheff Wed manager on BBC Radio Sheffield
Image source, PA MediaWow, wow, wow.
Talk about a way to play. Sheffield Wednesday kept pressing, kept asking the questions.
What a wonderful night. I'm speechless.
We were dreaming, flippantly wondering whether we could do something that has never been done. I would have said, hand on heart, it was a massive task.
These fans have seen something special tonight.
Sheff Wed 4-0 Peterborough (agg 4-4) - extra time to follow
Incredible.
The 90 minutes are all over. Liam Palmer's scrappy late goal has completed Sheffield Wednesday's turnaround.
Peterborough are stunned. We've got another half an hour of this and possibly penalties.
Strap yourselves in.
Liam Palmer
Oh my word, they've done it.
How? What? Who? When? Why? Ahhhhh.
I cannot believe what I've just seen. Liam Palmer has slipped the ball home inside a crowded box as Peterborough makes a hash of clearing another Sheffield Wednesday ball into the box.
What drama!
We're off to extra time! Remarkable!
Sheff Wed 3-0 Peterborough (agg 3-4)
Dear oh dear.
Another long Sheffield Wednesday ball is tamely whipped into the Peterborough box for Will Norris to scoop up.
The Owls' season is about to end.
Sheff Wed 3-0 Peterborough (agg 3-4)
Will Norris, take a bow.
The Peterborough keeper rises high to claim a Callum Paterson header across the face of goal.
That's surely it now.
Sheff Wed 3-0 Peterborough (agg 3-4)
Sheffield Wednesday win a free-kick just inside the Peterborough half and past the halfway line.
It's sent into the box but it's claimed by Posh keeper Will Norris.
Moments later Norris claims another long ball into the box. He's been immense tonight.