Charles Nesbitt, an expert on chemical weapons, threatens to contaminate the water sources of London with a lethal hallucogenic drug and in order to back up his claims, plans several small 'demonstrations' in warning to the local authorities - including CI5.
| Name | Type | Role | |
|---|---|---|---|
| Anthony Read | Writer | ||
| Keith Barron | Guest Star | ||
| Trevor Adams | Guest Star | ||
| Penny Irving | Guest Star | ||
| Peter Penry-Jones | Guest Star | ||
| Donald MacIver | Guest Star | ||
| Malou Cartwright | Guest Star | ||
| Donald Douglas | Guest Star | ||
| Angus MacKay | Guest Star | ||
| Di Trevis | Guest Star | ||
| Christopher Ellison | Guest Star | ||
| Melanie Peck | Guest Star | ||
| Gloria Walker | Guest Star | ||
| Ian Fairbairn | Guest Star | ||
| Douglas Camfield | Director |