The defense and the prosecution have rested and the jury is filing into the jury room to decide if a young Spanish-American is guilty or innocent of murdering his father. What begins as an open and shut case soon becomes a mini-drama of each of the jurors' prejudices and preconceptions about the trial, the accused, and each other.
| Actor | Role |
|---|---|
 Martin BalsamJuror 1 | Juror 1 |
 John FiedlerJuror 2 | Juror 2 |
 Lee J. CobbJuror 3 | Juror 3 |
 E.G. MarshallJuror 4 | Juror 4 |
 Jack KlugmanJuror 5 | Juror 5 |
 Edward BinnsJuror 6 | Juror 6 |
 Jack WardenJuror 7 | Juror 7 |
 Henry FondaJuror 8 | Juror 8 |
 Joseph SweeneyJuror 9 | Juror 9 |
 Ed BegleyJuror 10 | Juror 10 |
 George VoskovecJuror 11 | Juror 11 |
 Robert WebberJuror 12 | Juror 12 |
 Rudy BondJudge (uncredited) | Judge (uncredited) |
| TTom GormanStenographer (uncredited) | Stenographer (uncredited) |
| JJames KellyGuard (uncredited) | Guard (uncredited) |
| BBilly NelsonCourt Clerk (uncredited) | Court Clerk (uncredited) |
| WWalter StockerMan Waiting for Elevator (uncredited) | Man Waiting for Elevator (uncredited) |
| JJohn SavocaDefendant (uncredited) | Defendant (uncredited) |