Ian and Barbara find a temple in the middle of a hostile jungle. Inside is the ailing Darrius, keeper of one of the keys. As Darrius dies he gives Ian a clue to find the key.
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Robin Phillips | Guest Star | ||
| Katherine Schofield | Guest Star | ||
| Martin Cort | Guest Star | ||
| Edmund Warwick | Guest Star | ||
| John Gorrie | Director |