A day after UD Ibiza and Barcelona threatened to provide a signature upset in the Copa del Rey, Cultural Leonessa and Atletico Madrid did the darn thing.
Joao Felix set up Angel Correa for an early goal as a strong Atleti took a lead over their third-tier hosts into the final throes of the match.
That's when Julen Castenada Nuin scored to force extra time, where 20-year-old Sergio Benito sent the Estadio Reino de León into ecstasy with a winner.
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Atleti has made it to 19 finals, winning 10. Diego Simeone's men go out in the Round of 32 this season.
Several La Liga sides bowed out this round, and two to third-tier sides on Thursday after Badajoz beat Eibar. Also eliminated were Mallorca, Levante, Valladolid, Espanyol, Celta Vigo, and Real Betis.
Love this game: