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Iron Mike had retired from boxing a year prior when he got the call from the World Cage Fighting Championship to be a referee and duly accepted the offer to be inside the Octagon for the event featuring fighters from the United Kingdom, Russia, the US, Japan, Brazil and more.
Tyson put on his referee's shirt at the Manchester Evening News Arena and called the bout between Spaniard Diego Gonzalez and 20-year old Terry Etim, a Liverpudlian who went on to fight in the UFC.
The fight lasted just one round when Gonzalez tapped out to Etim's triangle choke just 59 seconds into the bout, leading to Tyson raising his hand and declaring him the winner.
Seeing him as a ref and his job being to control two fighters tearing each other limb for limb, but fans of WWE will point out that Tyson has carried out a similar role before.
In a move that many believed saved WWE, Tyson, having been suspended from boxing, was paid $3.5 million by Vince McMahon to be special guest enforcer for the main event of Wrestlemania 14 between Shawn Michaels and Stone Cold Steve Austin, who he brawled with beforehand in one of the most memorable moments in wrestling history.
Tyson counted the pinfall for Austin's first WWE championship victory and when Michaels put his hands on him, HBK was sent crashing to the canvas after being hit with a deadly right.
A lifelong wrestling fan, The Baddest Man On The Planet was inducted into the WWE Hall of Fame in 2012.
But how would we have done competing inside the Octagon?
Tyson himself has gone on record to say that if he was an 18-year old up and coming boxer in the modern era, he "probably" would have trained in MMA.
However, the closest thing we've got to seeing Tyson do MMA is the time that he was a referee.
The American returned to the boxing ring at the end of last year, 15 years after retiring, when he took on Roy Jones Jr in an exhibition fight.
Whether we see him again in 2021 remains to be seen.
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