K'Anpo persuades the Doctor he must face his fear and return the crystal to the Great One.But first they need to get past Barnes and his men.
| Name | Type | Role | |
|---|---|---|---|
| Barry Letts, Robert Sloman | Writer | ||
| Ralph Arliss | Guest Star | ||
| George Cormack | Guest Star | ||
| Kismet Delgado | Guest Star | ||
| Tom Baker | Guest Star | ||
| Maureen Morris | Guest Star | ||
| Gareth Hunt | Guest Star | ||
| Barry Letts | Director |