Real Madrid had a real grip on the semi-final place in the Champions League after the 3-1 victory away against Chelsea in the first meeting.
The London team started the return strongly, Mason Mount shot in one from close range.
At the beginning of the second half, Antonio Rüdiger nodded in 2-0 to Chelsea on a corner.
In the 65th minute, Kai Havertz also made it 3-0 to Chelsea, but the goal was ruled out after a VAR review.
Shake end
Instead, Timo Werner stepped forward and fixed an unlikely 3-0 - and Real Madrid was heading for a failure after the 3-1 win in the first match.
Then Luka Modric served a running Rodrygo in a delicate way, which put 1-3 - the match to extra time.
Benzema match hero
It only took six minutes in extra time before Karim Benzema, who else, nodded in 2-3 to Real Madrid, which meant that the Spaniards were then in the semifinals.
The result stood and Real Madrid finally managed to defend the lead from the first meeting, Real Madrid to the semi after a total of 5-4.