Ian and Barbara discover that the paralysed Bennett has gone missing from his cabin. The Doctor discovers the truth about Koquillion, but endangers his own life in doing so.
| Name | Type | Role | |
|---|---|---|---|
| David Whitaker | Writer | ||
| Tom Sheridan | Guest Star | ||
| Ray Barrett | Guest Star | ||
| Sydney Wilson | Guest Star | ||
| Christopher Barry | Director |