The true story of Greville Wynne, the British businessman who doubled as a spy on his trips to Russia, and Colonel Penkovsky, the high-ranking Soviet Intelligence officer who passed key information to the West.
| Actor | Role |
|---|---|
 David CalderGreville Wynne | Greville Wynne |
 Christopher RozyckiOleg Penkovsky | Oleg Penkovsky |
| FFiona WalkerSheila Wynne | Sheila Wynne |
 Frederick TrevesJames | James |
 Denys HawthorneNewson | Newson |
 Paul GeoffreyRoger Prince | Roger Prince |
 Ed BishopAlexander | Alexander |
 Donald BurtonNorman Kindell | Norman Kindell |
 Philip MadocGorny | Gorny |
 Alexander DavionLevin | Levin |
 Stefan GryffBodenikov | Bodenikov |
 George RoubicekOslaf | Oslaf |
 Guy DeghyDabrondin | Dabrondin |
 George PravdaBorisglebsky | Borisglebsky |
 Peter MartinOldfield | Oldfield |
| FFrank DuncanBorovik | Borovik |
 Robert PughInterrogator | Interrogator |
| JJohn RoweInterrogator | Interrogator |