Sheffield Wednesday pulled off the greatest comeback in English Football League playoff history as they overturned a 4-0 first-leg deficit against Peterborough United to reach the League One playoff final via a penalty shootout on Thursday.

Wednesday, who narrowly missed automatic promotion from the third tier and finished 19 points above Peterborough in the regular season, looked down and out after Friday's hammering.

But roared on by the home fans at Hillsborough, they turned the tie on its head to win 5-1 on the night after extra time and then held their nerve to prevail 5-3 in the shootout to spark wild scenes of celebration with the fans invading the pitch.

Michael Smith got the comeback under way with a penalty after nine minutes and Lee Gregory halved the arrears before halftime to give Wednesday belief.

Reece James made it 3-0 on the night and in the eighth minute of stoppage time Liam Palmer prodded home from close range to spark pandemonium in the stands.

Another twist saw Peterborough edge ahead on aggregate in the first half of extra time when a cross deflected in off the unlucky Gregory. But a weary Wednesday would not give in and Callum Paterson's cool finish in the 112th minute sent the game into a shootout.

Wednesday then scored all of their penalties while Dan Butler thumped his against the bar for Peterborough.

Jack Hunt dispatched the crucial kick to send Wednesday to Wembley and a chance to return to the Championship.