S1, E1: Designed by 30-year boxing veteran Don Lee, this is the ultimate survival competition. Age, weight, and profession don't matter. If you have the heart of a boxer, you're in. Ninety fighters from all walks of life - pros, amateurs, MMA fighters, soldiers, and students - put everything on the line. Once in the locker room, the boxers check each other's faces and explore their potential competitors. Before they even get to feel nervous, the battle begins instantly with an epic 1-on-1 showdown across nine rings. In the squared circle, it's just you, one opponent, and no time limit. Fight with everything you've got to survive. Master Don Lee's calls can change destinies, and shocking twists await at every turn.