OZ chronicles the attempts of McManus (Terry Kinney) to keep control over the inmates of Em(erald) City as well as the drug trade and the violence. There have been many groups of inmates during the run of the show and not everybody makes it out alive. There's the gangstas (Adebisi, Wangler, Redding, Poet, Keene, Supreme Allah), Muslims (Said, Arif, Hamid Khan), Italians (Pancamo, Nappa, Schiebetta), bikers (Hoyt), Aryans (Schillinger, Robson, Mark Mack), Christians (Cloutier, Cudney), Latinos (Alvarez, Morales, Guerra, Hernandez), gays (Hanlon, Cramer) and a whole pile of others (the O'Riley brothers, Keller, Stanislovsky, etc.). And there's a great "everyman" character called Beecher who gives a good look at a normal man who made one tragic mistake. Besides the regular inmates, there's guest stars such as Method Man, Luke Perry, Master P, Treach, etc. and a bunch of prison staff doctors (Dr. Nathan), a nun/psychologist (Sister Peter Marie), a bunch of guards some honest, some crooked and of course the warden Leo Glynn. The whole thing is narrated and held together by inmates Augustus Hill, who provides the show with some context, some sense of theme, etc. and ties everything together really nicely.

On-screen brothers Ryan and Cyril O'Reilly are played by real-life brothers Dean Winters and Scott William Winters. Their brother Brad Winters is also one of the writers for Oz.

Tobias Beecher:
I didn't kill Shemin.


Simon Adebisi:
Yeah, but you fucked him, though.


Tobias Beecher:
Once. He was lousy.

[Browne slams Beecher's head against a desk]


Tobias Beecher:
So were you, Mondo!

[Browne slams his head again]

Continuity: When Doctor Gloria Nathan (Lauren Velez) talks to Ryan O'Reilly (Dean Winters) about his cancerous tumour in his chest, she says that the lump is "under the left nipple". However, he was clearly bleeding from the right nipple and ever clutching the right one while in the infirmary...