Once a legendary MMA champion known as "Ghost", Kane was framed for doping by his agent Max and banned for life. Five years later, he runs a shabby gym in the slums. When an underground fighting tournament named IRON CIRCUIT offers a five-million-dollar prize, Max attempts to take it over. Kane enters the competition masked under the alias "Revenant", aiming to defeat Max’s new protégé Tyler and expose the truth. Past his prime, he barely survives each round with his student Dante as his sparring partner. The undefeated Revenant goes viral, until Max leaks Kane’s tainted record and flips public opinion against him. After Dante is severely injured, Kane considers quitting. "Falling down is not shameful; staying down is," Dante tells him. Inspired, Kane steps into the final under his real identity. Nicole, the female founder, releases evidence of Max’s match manipulation. Trapped for two rounds, Kane makes a stunning comeback with his signature "Ghost Step" and submits Tyler with a rear-naked choke. Tyler admits he was merely a pawn. Max is investigated, reshaping the fighting industry. Kane expands his gym with the prize money and builds a transparent fighting platform with Nicole. Fully recovered, Dante makes his professional debut wearing Kane’s old jersey.
