Samuel Chukwueze came on in the second half to score the vital equaliser as Villarreal dumped Bayern Munich out of the Champions League following a 1-1 draw in the second leg of their quarter-final clash at the Allianz Arena.
Villarreal went into the game knowing they only needed to avoid a defeat after claiming a stunning 1-0 in the first leg at the Estadio de la Ceramica last week.
Still, the odds were stacked against them as they were facing a Bayern Side that had won all of their previous four home games in the competition this season with a combined score of 20-3.
Villarreal manager Unai Emery set up his team to defend deep, knowing his side could not afford to take the game to the home side.
The plan did work as the Yellow Submarines held Bayern to a goalless draw in the first half. However, Emery's work was undone seven minutes after the break as Robert Lewandowski put the Bavaria giants ahead with a simple finish off the post following a pass from Thomas Muller.
The goal put Bayern back into the tie and also made them favourites to win it from there. But Julian Nagelsmaan's men could not find the second goal as a well-organised Villarreal side defended resiliently.
Villarreal's plan frustrated Bayern, who then had to try speculative shots from outside in search of a second goal.
But just as the game appeared to be heading for extra time, Emery sent on Chukwueze for Francis Coquelin in the 84th-minute.
The decision proved to be a masterstroke as the Nigerian scored four minutes after his introduction to silence the home crowd.
Chuwkeuze fired into the roof of the net after a brilliant counterattack from the Yellow Submarines.
It was his sixth goal of the season, with four coming as a substitute, including two in the Champions League.
Chukwueze's goal stunned Bayern, who piled pressure in the final minutes in search of a second goal.
However, Villarreal held on to record a famous upset. The Yellow Submarines will now meet either Liverpool or Benfica, with the former currently holding a 3-1 lead in that tie.