Ricki Tarr, an active agent, recounts a tale to the spy masters that sways Smiley in favour of returning to the Circus to secretly ferret out the mole. Tarr's tale is of The Sandmann, the KGB counterpart and nemesis of Smiley, and of his network in the Circus.
| Name | Type | Role | |
|---|---|---|---|
| Arthur Hopcraft | Writer | ||
| Susan Kodicek | Guest Star | ||
| Hilary Minster | Guest Star | ||
| Pauline Letts | Guest Star | ||
| Stephen Earle | Guest Star | ||
| Thorley Walters | Guest Star | ||
| John Irvin | Director | ||
| John le Carré | Director |