The British High Command finds itself in the thick of a huge dilemma when it is realized that they have long been infiltrated by spies from a German intelligence group. This all happens during the preliminary stages of the Battle of Britain.
| Actor | Role |
|---|---|
 Frederick StaffordCaptain Paul Stevens | Captain Paul Stevens |
 Van JohnsonAir Marshal George Taylor | Air Marshal George Taylor |
 Francisco RabalMartin | Martin |
 Ida GalliMeg | Meg |
 Luigi PistilliMaj. Kreuger | Maj. Kreuger |
 Renzo PalmerSgt. Donald Mulligan | Sgt. Donald Mulligan |
 Luis DávilaJacques | Jacques |
 Christian HayGaston | Gaston |
 Jacques BerthierColonel Smith | Colonel Smith |
 Teresa GimperaSheila | Sheila |
| GGeorge RigaudBritish general | British general |
 Eduardo FajardoGerman officer | German officer |
 Ugo AdinolfiBaker | Baker |
 Umberto Di GraziaNot listed | Not listed |
 Ricardo ValleNot listed | Not listed |
 Edy BiagettiKarl | Karl |
 Ángel del PozoEnglish airman | English airman |
 Alfredo MayoEnglish officer | English officer |
 Walter PatriarcaCameraman at Dunkirk | Cameraman at Dunkirk |
 Alfonso RojasEnglish officer | English officer |