The Doctor makes one final desperate effort to free his friends.
| Name | Type | Role | |
|---|---|---|---|
| Gerry Davis, Elwyn Jones | Writer | ||
| Sydney Arnold | Guest Star | ||
| Andrew Downie | Guest Star | ||
| Donald Bisset | Guest Star | ||
| Guy Middleton | Guest Star | ||
| Hannah Gordon | Guest Star | ||
| Michael Elwyn | Guest Star | ||
| Hugh David | Director |