Milton Keynes Dons saw off Grimsby in the Johnstone's Paint Trophy final with two second-half goals at Wembley.
Grimsby will regret missing a penalty in the first half, when Danny Boshell's effort was saved by Willy Gueret.
Keith Andrews put the Dons ahead with a controversial penalty given by referee Phil Joslin seconds after his assistant had flagged a Dons player offside.
And just minutes later, a powerful Sean O'Hanlon header from Colin Cameron's corner made sure of the victory.
Boshell had been brought down by Gueret for the Grimsby penalty, but the French goalkeeper redeemed himself with a smart stop.
606: DEBATE
Both sides had other penalty claims turned down as the first half remained goalless - notably when Grimsby defender Nick Fenton appeared to handle a cross.
But in a crucial few seconds of action, Cameron's curling shot hit the post, and with at least one Dons player appearing to stand in an offside position, the assistant referee's flag was raised.
But Joslin pointed to the spot after adjudging that Nick Hegarty's subsequent challenge on Danny Swailes deserved a penalty.
If Grimsby's hearts were broken by that decision, they were well and truly shattered when O'Hanlon's header, which went in off Rob Atkinson, made it certain that Paul Ince's side - with captain Andrews leading from the front - would be collecting their first trophy.
Milton Keynes Dons manager Paul Ince:
"We created a lot of chances, and it was just a case of waiting for one to go in, but we seem to be good at scoring penalties in this competition."
Grimsby boss Alan Buckley:
"But we've got no complaints after 90 minutes. They're a decent team and pass it well, but goals change games - we had a golden opportunity with our penalty but didn't take it."
Grimsby: Barnes, Clarke, Atkinson, Fenton, Newey, Hegarty, Hunt (Toner 79), Bolland, Boshell, Till (Jones 61), North (Bore 46).
Subs Not Used: Montgomery, Bennett.
Booked: Boshell.
Milton Keynes Dons: Gueret, Stirling, O'Hanlon, Swailes, Lewington, Andrews, Navarro, Dyer, Cameron (Baldock 90), Johnson (Wright 77), Gallen (Wilbraham 77).
Subs Not Used: Abbey, Edds.
Booked: Navarro.
Goals: Andrews 74 pen, O'Hanlon 81.
Att: 56,618
Ref: Phil Joslin (Nottinghamshire).