On the surface, not much has changed inside the walls of Oswald State Penitentiary. As the sixth and final season of the acclaimed HBO drama series reveals, Vern Schillinger has revenge on his mind; Cyril O'Reily is facing execution; Tobias Beecher is hoping for parole; and Tim McManus is finding solace in a meditative maze. But there's toil and trouble brewing in the Oz cauldron. As Emerald City thespians rehearse for a prison production of Macbeth, a denouement of Shakespearean proportions awaits its cast. Despite the efforts of prison officials and reform-minded prisoners, Em City has continued to breed violence, prejudice, and rage . . . a pattern that promises to escalate into a memorable series finale. Kirk Acevedo, Ernie Hudson, Terry Kinney, Rita Moreno, Harold Perrineau, J.K. Simmons, Lee Tergesen, Eamonn Walker, and Dean Winters head up the ensemble cast.