A hero is someone who has done something that no one else has been able to do.
Millwall were rewarded with a promotion in the Scottish Championship in December.
This meant they would face Rangers in the play-offs, which they lost 2-0.
They went on to beat Aberdeen in the FA Cup final, beating Aberdeen again.
It’s a momentous occasion for the footballing community.
It was a year after a devastating season in the Championship for Millwall, who finished the season 13th.
But the achievement is just the beginning.
More to come.