Ricardo Vaz Te's goal in the 87th minute broke Blackpool hearts as West Ham returned to the Barclays Premier League with a 2-1 victory in the play-off final.
The winner came after Carlton Cole bulldozed through the Blackpool defence and Matt Gilks could only divert the ball into the path of Vaz Te who fired into the roof of the net.
The effort and determination of the Seasiders could not be faulted, particularly after going a goal behind in the first half to a Carlton Cole goal.
The opener came on 35 minutes and separated the sides at half-time. The big centre-forward received a lofted ball from Matt Taylor, which he dispatched confidently past Gilks.
Blackpool could have been leading after just three minutes when Stephen Dobbie pounced on a Matt Taylor error, but his shot was palmed onto the post by Rob Green from an acute angle.
Dobbie's effort was one of several for the Seasiders before West Ham scored. The best opportunity fell to Matt Phillips, who could only hit his shot straight at Rob Green after being played through by Kevin Phillips.
A minute later and Matt Phillips was in again. This time he capitalised on poor defending from Guy Demel before cutting inside and bending a right footed effort wide of the far post.
Thomas Ince was full of running and often got in behind West Ham but failed to create any meaningful opportunities in the first half.
Ian Holloway's men were certainly not afraid from shooting in the first period but unfortunately for the Tangerines a lot of long range efforts found the crowd rather than the net.
Into the second half and Blackpool came out firing and deservedly levelled after 47 minutes through the impressive Ince, who was booed throughout by the West Ham supporters.
He charged onto a long ball from Matty Phillips, which he let bounce a couple of times before volleying it into the bottom left hand corner, sparking jubilation among the Blackpool supporters and players.
Alex Baptiste almost turned the game on its head within four second half minutes but his dink over over West Ham goalkeeper, Rob Green, was cleared off the line by Winston Reid.
As the second half continued Blackpool continued to dominate with Thomas Ince continuing to pose a threat on the right flank and Matty Phillips on the left.
A superb passing move midway through the second half ended with Neal Eardley cutting the ball back to Stephen Dobbie but he could only scuff his shot wide.
As the game wore on there were some tired legs on show but Blackpool showed no signs of letting up.
Dobbie hit a free-kick low and hard from 30 yards out but Green saved down to his left, before Kevin Nolan hit a rasping volley against the Blackpool crossbar on 83 minutes.
With the possibility of extra-time getting ever closer, Vaz Te popped up with the goal to shatter Blackpool's Premier League aspirations for at least another season and send West Ham back up to the top flight at the first time of asking.