In the pilot episode, we meet the diverse residents of an experimental prison within a prison known as the Emerald City.

Schibetta and the prison brass race to uncover Ortolani's killer--for different reasons.

The Warden threatens to lock the prison down unless inmate leaders can keep their boys quiet.

Governor Devlin has reinstated capital punishment in the state—and the first Oz prisoner scheduled to die is Jefferson Keane.

The effort to find out who's smuggling drugs into prison backfires in a deadly way.

The prison's health service is kept busy by a variety of prisoner complaints.

A recovered Said ostracizes Huseni Mershah for turning his back on him when he was dying—and orders all the Muslims to cast him out. Beecher finally gets his revenge on his nemesis, Schillinger.

In the Season One finale, a riot breaks out and frustration, sexuality, hate, revenge and racism all rear their ugly heads, causing the violence to escalate.