After a scripted war of words, the two engaged in a brawl - as a sea of security guards and WWE wrestlers made attempts to pull them apart.
Cain Velasquez has become the latest UFC star to make the switch over to WWE, joining in the footsteps of Ronda Rousey and Brock Lesnar.
Former two-time UFC Heavyweight champion Cain Velasquez has signed a multi-year deal with WWE, according to Marc Raimondi of ESPN. After Michael Cole started things off, Triple H took the stage and he starting hyping WWE Crown Jewel. But me being the undefeated lineal heavyweight boxing champion, I fear no man.
Fury said he was "honoured" to compete in the WWE and described himself as "a lifelong fan" of the sports entertainment organisation.
The 37-year-old has had his eye on wrestling for the better part of the last decade.
He has fought just three times since 2013, dropping the heavyweight title to Fabricio Werdum in 2015 and rebounding to beat Travis Browne at UFC 200 in 2016.
In a media scrum conducted after the press conference, Velasquez spoke about what the transition from MMA to professional wrestling has been like as he performed in one of Mexico's premiere promotions these past few months.
His long-awaited return in February lasted just 26 seconds when an uppercut from Francis Ngannou sent him to a TKO loss (and yet another injury when his knee gave out while falling). They love it. They're super-excited.
"I had my people get in contact with the WWE so we could go to the training center and just mess around and see if I could even do this".