Mystery surrounds the death of a patient; another has given birth to a child, father unknown. 'Irregular' occurrences in a government psychiatric hospital build to a terrifying climax.
| Actor | Role |
|---|---|
 Derek NewarkRoote | Roote |
 Angela PleasenceMiss Cutts | Miss Cutts |
| MMichael ForrestTubb | Tubb |
 Edward de SouzaLobb | Lobb |
| RRoger DavidsonLamb | Lamb |
 Robert EastLush | Lush |
| JJames GrantGibbs | Gibbs |