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Lesnar is a former heavyweight champion and last competed in the promotion back in 2016 against Mark Hunt.
Rumours of 'The Beast Incarnate' returning to the franchise have whirled for months and he'll be available if you play the game before October 30.
He will be a four-star rated fighter and boasts an impressive four and a half-star grappling skill.
Alongside Lesnar in the update will be Russian fighter Askar Askarov and flyweight Jennifer Maia.
Those two are also set to be four-star rated.
New Halloween vanity items will drop on October 22 and October 29, which include the Skeleton vanity set, Skulls and Roses shorts among other items.
40 new cosmetic items are coming to the game in one of the biggest updates yet.
UFC 4 will open the Octagon to all players with Free Play Days running from Thursday, October 22 until Sunday, October 25 at 11:59pm PST.
The addition of Lesnar means fans can pit him against current UFC heavyweight champion Stipe Miocic, Francis Ngannou or finally set up a super fight against Jon Jones.
For a more obscure twist, he could take on boxing stars Anthony Joshua and Tyson Fury.
Both champions were added to the game for those who bought on launch.
UFC 4 Creative Director Brian Hayes told SPORTbible: "It's fun to have characters in the game from a fantasy standpoint.
"To be able to casually and virtually explore what it would be like to take someone like Anthony Joshua or Tyson Fury into the Octagon and have a go, it's just good video game fun.
"When fighters like that are willing to work with us and interested in being in the product, we're stoked about it. We know that fighters like Bruce Lee and Mike Tyson have been really popular in the game so just thought about who are two big personalities in the boxing world that we could bring into the experience this year.
"They are the two names that come to the top of the list because heavyweight boxing is really seeing a resurgence. We settled on Joshua and Fury because they are massive superstars.
"For people that want another Fight Night game I'm not sure this completely bridges the gap but it does dip a toe in the water so to speak.
"With the options that we have in game, being able to play 'Stand and Bang' mode or Knockout mode it's strikes only. Then we have the ability with 'Blitz Battles' where we have a setting where it's potentially boxing only for a day and you take Tyson Fury and go in and piece people up.
"It's nice to have and it's way better than nothing, that's for sure."
Featured Image Credit: EA Sports
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