Oz is in upheaval following the return of Martin Querns. Meanwhile, Howell and Robson each receive troubling news, Mukada answers an unsolved mystery, and the O’Reilys struggle to make amends….

Everyone has a different opinion of new inmate Idzik; Alvarez receives shocking news; Redding’s attempts at reform continue; Murphy makes a confession to Glynn; Morales'(David Zayas) medical suspicions are confirmed;…

Glynn receives some good and bad news on the toxic-poisoning case. Meanwhile, Rebadow’s relationship with Stella hits a snag; Keller and Beecher work out a mutually beneficial arrangement; Poet and…

Schillinger has a disappointing visit with his “hero”, Mayor Loewen. Glynn has to face up to the truth when Oz loses its first prisoner to toxic poisoning. Down in solitary,…

The unexpected arrival of Mayor Wilson Loewen at Oz spurs an ironic turn involving Schillinger and Beecher. Meanwhile, Dr. Nathan discovers why solitary inmates are getting sick; a new business…

At the bi-annual review of solitary prisoners, the board decides to release Alvarez and Schillinger back into gen pop. Rebadow, still mourning the loss of his grandson, gets transferred to…

Robson returns from solitary to discover he’s been kicked out of the “Brotherhood” and moved to another cell. McManus tells Glynn he’ll write a letter supporting Alvarez’s bid for parole….

Redding discovers that Busmalis lied about DeSantos. Furious, he confronts Morales and the confrontation gets the two of them thrown in the hole. Cyril gets convicted of the murder and…

Said returns from the hole ready to apologize to White. The inmate variety show takes shape with Busmalis as MC and White the featured performer. Robson’s painful teeth force him…

Said and Arif go to Warden Glynn about Lalar’s murder. Angry and full of rage, Said then confronts White about passing drugs. Unsatisfied with White’s response, Said beats White severely,…

After recovering from his shank wound, Alvarez gains a follower. Busmalis starts a letter writing campaign to get “Miss Sally’s Schoolhouse” back on the air. Rebadow finds a way to…

Alvarez and Guerra come up with a new way to settle their beef — Guerra will stab Alvarez in the shoulder without killing him. Morales questions Guerra’s decision to do…

A ribbon cutting ceremony, complete with the Governor doing the honors, signals the opening of a newly constructed Oz. Warden Glynn doesn’t resign but he’s more battle weary. White, Alvarez…

In the Season Four finale, Hill discovers where his true allegiances lie. Redding’s plot to use the Colonel against Morales has an unexpected outcome. Cloutier runs into trouble from his…

McManus calls a superficial truce between Redding and Morales. Basil finally sees his wife, but Hughes ends up spoiling their happiness. Meanwhile, Cyril’s latest outburst proves to be the last…

O’Reily is in for a surprise when a visitor reveals the truth about his past, while Cyril faces trouble for his difficult behavior. Meanwhile, Morales and Redding lay out plans…

O’Reily regrets getting Cyril involved with the trial drug when it starts taking effect. Meanwhile, Giles’s request for an unusual method of execution creates controversy and the Chinese refugees are…

Robson and Hoyt tell Rev. Cloutier to back off of Schillinger. Schillinger and Beecher have their first counseling interaction session. Tidd continues to get close to Said by defending Arif…

New inmate Burr Redding arrives and stands ready to assume control of the drug business. Dr. Nathan returns. Tidd approaches Schillinger with a plan to kill Said. Several Asian refugees…

Adebisi’s death still looms large over Oz. Against Glynn’s better judgement and with special permission from the Gov., a TV news crew comes to Oz to film. Ryan O’ Reily…

After the press conference shooting incident, Glynn pulls out of the race. When a corpse is found in the laundry room, Querns demands Adebisi find out who did the deed….

Ryan and Howell get frisky. After leaving the hole and apologizing to Busmalis for the stabbing Rebadow suffers an attack due to a brain tumor. Busmalis reacts by doing what…

An investigation into Goergen’s death starts and Mobay’s anxious when the investigator targets him first. Tensions begin to rise as Querns turns a seemingly deaf ear and blind eye to…

Things get a bit lively on death row after Shirley Bellinger’s execution– Miles begins painting a self-portrait, Ginzburg’s health deteriorates from AIDS and Deyell severely injures himself. Mobay’s ordered to…

The kidnapping of Beecher’s children has everyone upset and Beecher inconsolable. Schillinger gets questioned and of course, claims to know nothing about the deed. Beecher decides to initiate his own…

All is crazy after Busmalis and Alvarez flee from Oz via one of Busmalis’ tunnels. Hernandez discloses details about the shooting to Glynn and mentions Tarrant getting the gun from…

Mobay has his first meeting with Adebisi. Glynn fires McManus after Tim makes a foolish outburst during the slain CO’s memorial service. Sister Pete still wrestles with ending her service…

The lockdown ends. After Hamid Khan’s body is taken off life support, the Muslim’s choose Arif to lead them. Meanwhile, Cyril’s having nightmares about delivering the fatal blow to Khan…

When his plea for an expedited return to solitary goes on deaf ears, Miguel takes matters into his own hands. Glynn finds out who raped his daughter. Hill gets sent…

Sister Pete’s anger is roused and forces her to confession. Wangler and Adebisi register a complaint to the Warden. Yet another inmate meets with demise. Bellinger enlists McManus’ help. Glynn…

In addition to the name change to “Oswald State Correctional Facility,” more changes abound. Newbies Coyle, Kahn, and Ricardo arrive and partner up with Wangler, Said, and Hernandez respectively. Adebisi’s…

Wittlesey is transferred to Gen Pop and replaced by Karl Metzger, a Nazi. Mack and another Aryan try to escape through Busmalis and Rebadow’s tunnel but the tunnel collapses and…

Cyril O’Reily, Ryan’s brother comes to Oz and is immediately violated by Schillinger. Ryan tries to get him away from OZ, but Cyril instead lands in the hole. El Cid…