On this day: Theo Walcott becomes England's youngest hat-trick hero
The 19-year-old claimed his first international goals as Fabio Capello's rampant side stunned Croatia with a 4-1 win in World Cup qualifying.
Manager Capello said: "He is young and so dangerous for defenders. He is one of the most important young players in England. At this moment, he is difficult to contain."
Walcott, keeping former captain David Beckham out of the side, drilled the dominant visitors into a half-time lead, before doubling the advantage with a carbon-copy second just before the hour mark.
Wayne Rooney added a third and, after Croatia - who had Robert Kovac sent off at 1-0 - pulled one back through Mario Mandzukic, Walcott had the final say, racing clear to slot home with eight minutes remaining.
Walcott, a shock selection for the 2006 World Cup by Sven-Goran Eriksson, was left out of Capello's 2010 squad and has never made a World Cup appearance.
The 31-year-old Everton man won the last of his 47 international caps in a friendly against Spain in November 2016.