While vacationing on the Riviera, John Drake recognises a professional assassin. He succeeds in replacing the killer and undertakes an assignment working in the dark, as he has no idea who his victim is.
| Name | Type | Role | |
|---|---|---|---|
| Ralph Smart | Writer | ||
| John Wynyard | Guest Star | ||
| Esmond Knight | Guest Star | ||
| Jacqueline Ellis | Guest Star | ||
| Richard Clarke | Guest Star | ||
| Barrie Ingham | Guest Star | ||
| Charles Lloyd Pack | Guest Star | ||
| Lawrence Davidson | Guest Star | ||
| Hugh McDermott | Guest Star | ||
| Patrick McGoohan | Director |