Sinister nuns plan to unleash the Gorgon on the world.
| Name | Type | Role | |
|---|---|---|---|
| Phil Ford | Writer | ||
| Audrey Ardington | Guest Star | The Abbess | |
| Joseph Millson | Guest Star | Alan Jackson | |
| Juliet Cowan | Guest Star | Chrissie Jackson | |
| Phyllida Law | Guest Star | Bea Nelson-Stanley | |
| Beth Goddard | Guest Star | Sister Helena | |
| Alice Troughton | Director |