A young woman feigns illness in order to infiltrate a mental hospital, where she investigates the disappearance of her sister, a former patient. Meanwhile, the hospital warden and her attendants abuse and torture their charges, forcing them to star in cheap skinflicks.
| Actor | Role |
|---|---|
 Dyanne ThorneGreta | Greta |
 Tania BusselierAbbie Phillips | Abbie Phillips |
 Lina RomayJuana | Juana |
 Eric FalkPablo Rego | Pablo Rego |
| AAngela RitschardRosa Phillips | Rosa Phillips |
 Howard MaurerGovernor | Governor |
 Esther StuderNo. 24 | No. 24 |
 Peggy MarkoffNo. 14 | No. 14 |
 Esther MoserNo. 18 | No. 18 |
 Jesús FrancoDr. Milton Arcos (as Jess Franco) | Dr. Milton Arcos (as Jess Franco) |
| DDagmar BürgerNo. 9 | No. 9 |
| LLorli BucherWardress | Wardress |
| SSandra L. BrennanNot listed | Not listed |
| AAlex ExlerNot listed | Not listed |
| KKarl GyslingPrisoner | Prisoner |
| RRoman HuberPrisoner | Prisoner |
| MMike LedererPrisoner | Prisoner |
| SSigad SharafNo. 20 | No. 20 |