England, 1940, during World War II. An MI5 officer, codenamed Jack King, infiltrates a network of conspirators, a British fifth column sympathetic to Nazi Germany, in order to control the organization and destroy it in the event of a German invasion. But who was he? A single person or several?
| Actor | Role |
|---|---|
| FFrédéric SanchezSelf - Narrator (voice) | Self - Narrator (voice) |
| SSébastien-Yves LaurentSelf - Historian | Self - Historian |
| SStephen DorrilSelf - Writer | Self - Writer |
| TThomas HennesseySelf - Historian | Self - Historian |
| MMichael JagoSelf - J. Bingham's Biographer | Self - J. Bingham's Biographer |
| MMichael SmithSelf - Former Intelligence Officer | Self - Former Intelligence Officer |
| NNigel WestSelf - Historian | Self - Historian |
| CCharlotte BradySelf - J. Bingham's Daughter | Self - J. Bingham's Daughter |
| RRichard DunleySelf - TNA Researcher | Self - TNA Researcher |
 Adolf HitlerSelf - Politician (archive footage) | Self - Politician (archive footage) |
 Winston ChurchillSelf - Politician (voice) (archive footage) | Self - Politician (voice) (archive footage) |
 Oswald MosleySelf - BUF Leader (archive footage) | Self - BUF Leader (archive footage) |