Barcelona faced a seemingly insurmountable task of overturning a 4-0 deficit.
Luis Enrique's Barcelona side started the game brightly, with Luis Suárez scoring in the 3rd minute to give them hope.
PSG, however, managed to score an away goal through Edinson Cavani in the 62nd minute, making it 5-3 on aggregate and seemingly putting the tie out of reach for Barcelona.
However, Barcelona staged an incredible late comeback. Neymar scored a free-kick in the 88th minute, then converted a penalty in the 91st minute.
With the aggregate score at 5-5, Barcelona needed one more goal to advance on away goals.
In the dying moments of the game, Sergi Roberto scored a dramatic winner in the 95th minute, sending Camp Nou into delirium and completing an astonishing 6-1 victory for Barcelona.
Barcelona won the tie 6-5 on aggregate and advanced to the quarter-finals, completing one of the most improbable comebacks in Champions League history.