A veteran Russian spy is brought out of retirement to be sent to the West to do an important sabotage job. However, he finds himself falling in love with an attractive British double agent.
| Actor | Role |
|---|---|
 Lorne GreenePeter Vanin | Peter Vanin |
 Rachel RobertsMegan Thomas | Megan Thomas |
 Anthony QuayleCol. Malendin | Col. Malendin |
 James DonaldSir Martin Rolfe | Sir Martin Rolfe |
 Harry AndrewsGen. Kirk | Gen. Kirk |
 Patrick MageeJohn Flack | John Flack |
 Patrick NewellJulius Bates | Julius Bates |
 Raymond HuntleySupt. Pode | Supt. Pode |
 Olaf PooleyIgor Trubenoff | Igor Trubenoff |
 Janina FayeElena Vanin | Elena Vanin |
 Josephine StuartElizaveta | Elizaveta |
 Angela PleasencePeace Girl | Peace Girl |
 Mary KerridgeLady Rolfe | Lady Rolfe |
| VVictor BeaumontKarl Kronig | Karl Kronig |
 Nikki Van der ZylMrs. Kronig | Mrs. Kronig |
 Richard VernonColonel | Colonel |