Insane scene in the squared circle Wednesday ... Mike Tyson kicked off a benches-clearing brawl by shoving Chris Jericho -- and UFC star Henry Cejudo was in the middle of it all!!
The fracas all went down toward the end of AEW Dynamite in Jacksonville, Fla. ... when Jericho called out Iron Mike for betraying him during a WWE match back in 2010.
Chris demanded Tyson apologize ... but Mike -- whose in-ring entourage included Cejudo and other MMA stars Vitor Belfort and Rashad Evans -- was having none of it.