Devil's End is sealed off from the outside world by a heat barrier. The Doctor and Jo return to the barrow where they are confronted by the gargoyle, Bok.
| Name | Type | Role | |
|---|---|---|---|
| Robert Sloman, Barry Letts | Writer | ||
| John Joyce | Guest Star | ||
| Jon Croft | Guest Star | ||
| James Snell | Guest Star | ||
| Stanley Mason | Guest Star | ||
| Christopher Wray | Guest Star | ||
| Rollo Gamble | Guest Star | ||
| Eric Hillyard | Guest Star | ||
| Christopher Barry | Director |