LOCATION: Islington, London, England DATE: May 12th A real estate agent, taking a man to see a warehouse, discovers a room constructed inside the warehouse. Worse, a dead body and a babbling man are locked inside the room. Stewart tries to interrogate the man, but he is killed before anything can be made of his babbling.
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Cyril Frankel | Director | ||
| Michael Robbins | Actor | Burton | |
| Peter Wyngarde | Actor | Jason King | |
| Peter Brett | Actor | Secretary to Seretse | |
| Toby Robins | Actor | Selina Trenton | |
| Frank Gatliff | Actor | Police Inspector | |
| Joel Fabiani | Actor | Stewart Sullivan | |
| John Hallam | Actor | Doug Martin | |
| Peter Reynolds | Actor | Steven Radlett | |
| Rosemary Nicols | Actor | Annabelle Hurst | |
| Juliet Harmer | Actor | Trish | |
| Martin Boddey | Actor | Harry Finch | |
| Dennis Alaba Peters | Actor | Curtis Seretse | |
| Clive Colin Bowler | Actor | Danny Terrill | |
| Anne Blake | Actor | Professor Bryant | |
| Stratford Johns | Actor | Paul Trenton |