Set in the late 1960s, Billy Jack is a complex character who embodies the struggles of identity and peace. He is a half-white, half-Indian ex-Green Beret Vietnam veteran turned pacifist and skilled Hapkido practitioner. After reconnecting with his Native American heritage, he returns from war to a reservation near a conservative town in Arizona. Here, he swiftly becomes the guardian of the wild mustangs and the innovative Freedom School, which is led by Jean Roberts alongside the Native community.
Conflict arises as Billy underscores his commitment to protect the school from the prejudiced local Sheriff Stuart Posner, his son Bernard, and Deputy Sheriff Mike. The latter is grappling with family turmoil as his pregnant 15-year-old daughter, Barbara, flees from her abusive father in Haight-Ashbury, only to return home and face further violence. When Billy meets her asleep in a field, he takes her to safety within the teaching environment of the Freedom School.
Initially, Bernard might appear sympathetic when he refrains from succumbing to his father's wishes of capturing the mustangs for dog food. However, a darker side soon emerges as he resorts to harassing the female students and violently tormenting his peers, particularly the Native American children. In a tragic turn, he assaults Jean and ultimately murders Martin, a kind-hearted Native American who had shown Barbara paths to love beyond physical intimacy. Bernard’s attempts to earn his father’s pride underscore a troubling cycle of identity and dysfunction.
As tensions escalate, it becomes clear that Deputy Mike and the Posners, along with many townsfolk, harbor deep-seated hatred towards both people of color and peace-minded whites. This growing animosity intensifies when the Freedom School is revealed to support at-risk youth from various backgrounds while defying traditional educational norms.
Following the brutal events, including Martin's death and Jean's assault, Billy Jack confronts Bernard in a seedy hotel, only to be met with violence. In a moment of self-defense, Billy Jack ends Bernard’s life with a decisive karate chop after forcing the young girl he was exploiting to leave.
In the aftermath, Billy and Barbara seek refuge in an abandoned church. A harrowing shootout with the law takes place, culminating in Deputy Mike's death and Billy sustaining a gunshot wound. After a night of concealment, Billy chooses to surrender, laying out terms for the Freedom School's protection. He negotiates that it be allowed to operate for the next decade without interference, that Jean becomes Barbara's legal guardian, and that the governor's office will hold annual progress conferences on the institution.
The terms receive approval, and with heartfelt farewells shared with Jean, Billy Jack accepts his fate. As he is taken away, the children from the Freedom School gather outside, expressing their support for Billy, raising their fists in solidarity while shedding tears for a man who fought not just for justice, but for love and understanding amidst a world filled with hatred.
