Luton were the first non-league side to beat a Premier League side in the FA Cup for 24 years when they beat Norwich 1-0 at Carrow Road. Coming on the back of their brilliant win over Wolverhampton Wanderers, they have shown teams that passion and hard work can make up for an apparent gulf in class.
They are competing in the fifth round for the first time since 1994 and were rewarded for their giant-killing with a home tie against Millwall.
The Lions having won four of the five previous meetings between these two sides in the FA Cup; losing the other.
They've also won five and lost just one of their last eight clashes with Luton in all competitions.
The Hatters have progressed in five of their last six FA Cup fifth round ties but never when facing a team from a higher division.
Millwall have won 13 and lost none of their last 17 matches in the FA Cup against sides from lower divisions.
Luton have a brilliant recent record on home soil having won seven and lost none of their last eight games in all competitions.
Millwall have won none of their last six on the road, losing four.