The Doctor escapes the castle with Sarah and Hal and must persuade Sir Edward to trust him before Irongron launches an attack on them.
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| Donald Pelmear | Guest Star | ||
| John J. Carney | Guest Star | ||
| June Brown | Guest Star | ||
| Sheila Fay | Guest Star | ||
| Steve Brunswick | Guest Star | ||
| Alan Bromley | Director |