因合同不尽人意，拳击手奥斯卡·“林戈”·博纳维纳心怀与阿里对决的梦想来到了内华达州雷诺施展拳脚。

　　A renowned MMA fighter juggles her life between fights in the ring and raising her seven-year-old son. After an incident at the boy's school, the woman is forced to transfer him to the "Wonderful Harbor" a facility recommended by the school psychologist. The young mother is unaware that the parents of the school's students come from a completely different world than her own. Among them is a single father, an influencer, and a devoted mother who has sacrificed everything for her son. Initially, the woman is skeptical about the school, but after her son befriends one of the students, the young mother must accept the new situation. However, it becomes apparent that "Wonderful Harbor" is not without its challenges, prompting the fierce instincts of the young mother to surface.

　　即将退役的拳击手（盖尔·加西亚·贝纳尔 Gael García Bernal 饰）迎来了他最后一次冲击冠军的机会，为了赶上比赛之夜，他和他的经纪人（迭戈·卢纳 Diego Luna 饰）共同对抗一种神秘力量。