Adam Collin was the hero as he saved two penalties to send Rotherham to back-to-back promotions as they triumphed over Leyton Orient 4-3 on penalties after an enthralling League One play-off final.
Collin kept out efforts from Mathieu Baudry and Chris Dagnall after it had finished 2-2 after 120 minutes to earn a return to the Championship after 10 years away.
It looked like Orient, who led the League One table for 22 weeks of the season, would end their 32-year absence from the second tier as Moses Odubajo and Dean Cox scored in five first-half minutes to put them firmly in control.
But the Millers hit back after the break with two goals from Alex Revell, against his former club, to send the game to extra time before Collin's heroics won it for Steve Evans' men.
It was harsh on Russell Slade's Orient as they played their part in an absorbing game.
An end-to-end contest was always on the cards as both sides scored freely during the regular season, with the Millers bagging 86 times and Orient 85, but a dour opening half hour did not follow the script.
However, the game burst into life with the first real moment of quality in the 34th minute and it was the highly-rated Odubajo that produced it to break the deadlock.
The Millers failed to clear a free-kick and the ball fell to the 23-year-old 20 yards out. He controlled it and let fly with a left-footed volley that arrowed through a crowd of players and into the top of the net.
Slade's men were on a crest of a wave and Odubajo then turned supplier five minutes later as they doubled their lead.
Some poor defending from James Tavernier allowed the winger to slide the ball across goal for Lee Cox to tap into an empty net.
The Millers desperately needed some inspiration and they almost found it on the stroke of half-time as Ben Pringle unleashed a 35-yard volley that dipped late, but landed on the roof of the net.
The Millers started the second half in much more promising fashion.
Tavernier and Pringle both curled free-kicks narrowly over, before they reduced their deficit from a third set-play in the 55th minute.
Tavernier sent in a delivery which Jamie Jones spilled under pressure and Revell stabbed into an empty net.
If that was an easy goal Revell was to excel himself with his next effort five minutes later as he sensationally made it 2-2 with a goal that even bested Odubajo's.
A loose ball fell to him and from 30 yards, he took a touch and fired a looping 35-yard volley over the head of Jones and into the top corner for his 13th of the season and the third against his former club.
Orient then found their feet and began to threaten, Lloyd James' dangerous cross causing panic in the Miller’s defence.
Evans' men came back and had two good chances to steal it in normal time, but top scorer Kieran Agard fired wide with a first-time effort and then the same player headed over.
Extra time was low on quality meaning the game would be decided on penalties.
Jones put his side in the ascendency with a low save to keep out Lee Frecklington's effort, but Collin rescued his side with two saves to send the Millers fans into raptures.