Anthony Chisholm

After a powerful gas explosion at the Oz high-security prison, the special section had to be closed for several weeks for extensive renovations. Now, the prisoners are able to come back to their cells.

Schillinger's visit with Mayor Loewan proves to be disappointing, Glynn must face the truth about the toxic poisoning problem at Oz, and Officer Brass spends some quality time with Morales.

McManus wants Said to help reform White; O'Reilly's mother teaches music at Oz; the FBI stirs up trouble.

Redding and Morales forge an uneasy defensive alliance; Keller returns; the Cloutier mystery deepens.

Mayor Wilson Loewen's arrival at Oz causes an ironic turn of events involving Schillinger and Beecher, and Dr. Nathan figures out why solitary inmates are becoming ill.

Penders, Hill and Alvarez train Seeing Eye dogs; Nathan and Howell have a heart-to-heart talk; Schillinger's gripe with Said turns deadly.