Netflix’s 2025 French action thriller K.O. follows Bastien, a former MMA fighter haunted by guilt after accidentally killing his opponent, Enzo, in a match three years prior. Living in seclusion, Bastien is approached by Enzo’s widow, who pleads for his help in finding her missing teenage son, Léo, who has vanished in the perilous districts of Marseille. Determined to make amends, Bastien embarks on a relentless quest to locate Léo, confronting brutal crime gangs and delving into the city’s dark underworld.
Along the way, he allies with Kenza, a determined young police officer committed to dismantling the criminal empires threatening their community. As Bastien battles external enemies and his inner demons, K.O. delivers a gripping narrative of redemption, sacrifice, and the enduring fight for justice.
