Claude Hooper Bukowski, a naïve young man from Oklahoma, arrives in New York City to enlist in the U.S. Army, ready to serve in the Vietnam War. During his brief stay, he encounters a group of free-spirited hippies led by the charismatic and rebellious George Berger. As Claude immerses himself in their lifestyle, he develops a close bond with them, particularly with Berger, who introduces him to a world of peace, love, and drugs. Their camaraderie intensifies when Claude meets Sheila Franklin, a beautiful and affluent woman who captures his heart. Together, the group embarks on a series of adventures, challenging societal norms and expressing their disdain for the establishment through music and dance.

As Claude's departure for boot camp looms, the group's carefree existence is threatened by the harsh realities of war and duty. With Claude torn between his newfound life of freedom and the obligations of military service, tensions rise, and the group's dynamic begins to shift. The story takes a dramatic turn as they confront the consequences of their choices, exploring themes of loyalty, friendship, and sacrifice amidst the turbulent backdrop of the 1960s counterculture movement.