Trying to obtain the first segment of the Key to Time, the Doctor and Romana are swept up in an elaborate con. The target – the homicidal Graff Vynda K.
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| Nigel Plaskitt | Guest Star | ||
| Iain Cuthbertson | Guest Star | ||
| John Harmill | Guest Star | ||
| Oliver Maguire | Guest Star | ||
| Paul Seed | Guest Star | ||
| Robert Keegan | Guest Star | ||
| George Spenton-Foster | Director |