Isaiah Bone (Michael Jai White) just got out of jail, where he spent quite a lot of time. His buddy was set up for a murder he didn't commit, the man who set him up also gets him killed while in prison and then he takes the dude's wife. Before he dies, his friend makes Bone promise to take care of his family if he doesn't make it out, which Bone promises. Bone finally gets out of the slammer but to get to the man who had his friend killed, he needs to work his way up the underground fight scene and luckily for Bone, he knows how to fight.
As Bone beats up a lot of guys, he becomes connected with the man who arranged his friend's death. He puts a plan into action on how to stick it back to the guy while reuniting his friend's family.
No complicated plot here, just good ol' fashioned revenge, a cheesy love story and a lot of man-on-man action (fighting action).
And one of the fighter's in the movie, also starred in an earlier Netflix pick, Miami Connection.