Mags goes to find Ace and Kingpin, pursued by the Chief Clown, while the Doctor confronts the power behind the Psychic Circus.
| Name | Type | Role | |
|---|---|---|---|
| Stephen Wyatt | Writer | ||
| Jessica Martin | Guest Star | ||
| T.P. McKenna | Guest Star | ||
| Deborah Manship | Guest Star | ||
| Lorna McCulloch | Guest Star | ||
| Peggy Mount | Guest Star | ||
| Jim Lancaster | Guest Star | ||
| Alan Wareing | Guest Star | ||
| Ian Reddington | Guest Star | ||
| Chris Jury | Guest Star | ||
| Kathryn Ludlow | Guest Star | ||
| Ricco Ross | Guest Star | ||
| Janet Hargreaves | Guest Star | ||
| David Ashford | Guest Star | ||
| Alan Wareing | Director |