They are among the most reliable witnesses to a crime — expert in their testimony and bulletproof in their account. Yet they never utter a single word. They are the animals, plants, and insects that are being recruited by a special breed of forensic scientists to solve the most seemingly impenetrable of crimes.
| Name | Type | Role | |
|---|---|---|---|
| Paul Christie | Guest Star | ||
| Nigel Marven | Director |