A recovered Doctor escapes the hospital and joins UNIT in their investigation. Meanwhile, Channing directs one of his Auton servants to recover a meteorite.
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| Hamilton Dyce | Guest Star | ||
| Betty Bowden | Guest Star | ||
| Neil Wilson | Guest Star | ||
| Henry McCarthy | Guest Star | ||
| Derek Smee | Guest Star | ||
| Antony Webb | Guest Star | ||
| Hugh Burden | Guest Star | ||
| John Breslin | Guest Star | ||
| George Lee | Guest Star | ||
| Derek Martinus | Director |