Grimsby Town, Manchester United and EFL Cup
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Grimsby led 2-0 inside the opening 30 minutes on home soil, with Charles Vernam and Tyrell Warren on the scoresheet, but Man United struck back in the final 15 minutes, scoring through Bryan Mbeumo and then Harry Maguire to force a penalty shootout in the League Cup.
BBC Sport looks at the history of the biggest FA Cup and EFL Cup upsets after Grimsby's shock win against Manchester United.
Manchester United have suffered the embarrassment of crashing out of the League Cup at the hands of fourth tier club Grimsby Town, in an epic penalty shootout at Blundell Park.