Martin Odegaard finally made his first Real Madrid start nearly two years after joining the club but Enzo Zidane stole the headlines in a 6-1 Copa del Rey rout.
Norway international Odegaard, who was regarded as one of the world's best young players when he signed from Stromsgodset in January 2015, was named in Zinedine Zidane's starting line-up for the clash with third-tier Cultural Leonesa.
But it was Zidane Jr - previously coached by his legendary father at Real's youth side Castilla - who marked his senior debut with a second-half goal in a 13-2 aggregate win.
Odegaard's sole appearance for the first team had previously come as a second-half replacement in a 7-3 victory over Getafe in the final game of the 2014/15 season.
And with El Clasico to come on Saturday, Pepe, Casemiro, Isco and Marco Asensio were all handed starts in a much-changed team.
Real, leading 7-1 from the first leg, took the lead after just 23 seconds as Mariano Diaz slotted home the first of his hat-trick.
James Rodriguez (23) headed home the hosts' second before Mariano (42) smashed in a third, but Leonesa did have a moment to savour when Yeray Gonzalez fired into the top corner from long range in first-half stoppage time.
Enzo was then handed his long-awaited bow by his father, but ensured there was to be no claims of nepotism when he finished off a flowing team move with a classy right-footed finish.
Mariano completed his hat-trick two minutes from time before a Cesar Morgado own goal rounded off the scoring and sent Real cruising through to the last 16.
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