Oz is a gritty, groundbreaking prison drama set within the Oswald State Correctional Facility, specifically focusing on 'Emerald City' (Em City), an experimental unit designed by Tim McManus to emphasize rehabilitation and education over traditional punitive measures. The series explores the complex power dynamics, racial tensions, and moral decay inherent in prison life, as inmates struggle for survival, dominance, and redemption within the claustrophobic confines of the facility. Narrated by the wheelchair-bound inmate Augustus Hill, the show features a sprawling ensemble cast representing various factions, including the Aryan Brotherhood, the Homeboys, the Muslims, the Italians, and the bikers. As the series progresses, the idealistic goals of Em City are constantly undermined by the brutal reality of violence, corruption, and the psychological toll of incarceration, pushing both the inmates and the correctional officers to their breaking points.