What should've been a comfortable midweek win for the Red Devils turned into a nightmare. Despite turning around a 2-0 deficit just before the 90-minute mark, United fell 12-11 in penalties after new big signing Bryan Mbeumo hit the crossbar on his attempt.

The Red Devils featured in the cup this early due to finishing 15th in the league last season, but now suffer their latest embarrassment during their downward spiral.

As for Grimsby Town, the win becomes one of their all-time significant results. Look at the scenes right after Mbeumo missed.

Here's what to know about the club following the shock result:

Grimsby Town is located in northeastern England in the coastal town of Cleethorpes.

The club began play in 1878.

The team's nickname is the Mariners given their coastal status.

Grimsby Town is currently playing in England's League Two, the fourth-best division in the country.

No. The club last played a season in England's top flight in 1946-47, right after World War II.

The Mariners have not won any of the key English trophies, but did earn the 1997-98 Football League Trophy, which is played between League One and Two teams and select under-21 sides.