 Roger Allamself (narrator) | self (narrator) |
 Annie MachonSelf - Former MI5 intelligence officer | Self - Former MI5 intelligence officer |
 Ben MacintyreSelf - Author of A Spy Among Friends: Kim Philby and the Great Betrayal | Self - Author of A Spy Among Friends: Kim Philby and the Great Betrayal |
| DDr. Helen FrySelf - British Intelligence historian | Self - British Intelligence historian |
| DDita GjurajSelf | Self |
 Tom BowerSelf | Self |
| RRoland PhilippsSelf - Author of 'A Spy Named Orphan: The Enigma of Donald Maclean' | Self - Author of 'A Spy Named Orphan: The Enigma of Donald Maclean' |
| JJames P. OlsenSelf - Former Chief of Counterintelligence at the CIA | Self - Former Chief of Counterintelligence at the CIA |
| MMiranda CarterSelf - Author of 'Anthony Blunt: His Lives' | Self - Author of 'Anthony Blunt: His Lives' |
| MMikhail Petrovich LyubimovSelf - Former KGB colonel | Self - Former KGB colonel |
| DDavid Haig ThomasSelf (archive footage) | Self (archive footage) |
 Adolf HitlerSelf (archive footage) | Self (archive footage) |
| HHarold RickettSelf (archive footage) | Self (archive footage) |
 Joseph StalinSelf (archive footage) | Self (archive footage) |
 J. Edgar HooverSelf (archive footage) | Self (archive footage) |
 Kim PhilbySelf (archive footage) | Self (archive footage) |
| GGuy BurgessSelf (archive footage) | Self (archive footage) |
| AAnthony BluntSelf (archive footage) | Self (archive footage) |
 Margaret ThatcherSelf (archive footage) | Self (archive footage) |
