- Keira Knightley (Helen Webb)
- Ben Whishaw (Sam Young)
- Sarah Lancashire (Mrs. Reed)
- Andrew Buchan (Wallace)
- Ella Lily Hyland (Williams)
Episode: The Opportunity to Become Savage
Air Date: 2026-11-05
Runtime: 57 min
East Berlin, 1988. Reed's cover in Kestrel is blown when a botched mission forces an unforgivable choice — and its deadly aftermath reaches into the present.