Professor Hood (Patrick Stewart) meets an old friend who believes his research into global warming is being sabotaged by persons unknown. He subsequently vanishes, having apparently destroyed all his work - and a few equations are all the clues he's left behind. The professor takes on the challenge of solving the puzzle, but he's forced to call on Rachel (Ashley Jensen) for protection as the mystery thickens.
| Name | Type | Role | |
|---|---|---|---|
| Stephen Gallagher | Writer | ||
| Tom Mannion | Guest Star | ||
| Ken Drury | Guest Star | ||
| Stephen Tomlin | Guest Star | ||
| Donald Sumpter | Guest Star | ||
| Susan Wooldridge | Guest Star | ||
| Roger Gartland | Director | ||
| Terry McDonough | Director |