When her sister turns up dead, Julia (Linda Jones) tries to convince the cops that a notorious gangster is to blame by going undercover as a prisoner to unearth the only witness to the crime. Problems arise when the sexually perverse warden (Rita Silva) adopts Julia as her new plaything and throws her noble mission off-course. Ajita Wilson and Alessandro Freyberger co-star in this erotically charged thriller.
Unfortunately the movie Hell Penitentiary is not yet available on HBO Max.
| Directing | Gianni Siragusa | Director |
| Writing | Sergio Garrone | Writer |
| Camera | Victor Parson | Still Photographer |
| Directing | Marjory McDonald | Script Supervisor |
| Editing | Daniele Alabiso | Editor |
| Directing | Richard Eames | Assistant Director |
| Sound | Frances Taylor | Music |
| Crew | Maurizio Centini | Cinematography |
| Editing | Tony Grant | Assistant Editor |
| Costume & Make-Up | Maria Teresa Carrera | Hairstylist |
| Costume & Make-Up | Joe Ferrante | Makeup Artist |
| Camera | Frank Kimberly | Camera Operator |
| Crew | Bernie Green | Sound Recordist |
