Strange deaths, men changing into monsters, hot green slime pouring out of the waste pipes – but Professor Stahlman is determined to press ahead with the Inferno project no matter what the cost!
| Name | Type | Role | |
|---|---|---|---|
| Don Houghton | Writer | ||
| Walter Randall | Guest Star | ||
| Nicholas Courtney | Guest Star | ||
| Olaf Pooley | Guest Star | ||
| Derek Newark | Guest Star | ||
| Christopher Benjamin | Guest Star | ||
| Sheila Dunne | Guest Star | ||
| John Levene | Guest Star | ||
| Derek Ware | Guest Star | ||
| Ian Fairbairn | Guest Star | ||
| Douglas Camfield | Director |