A World Air Force plane, carrying Commodore Goddard and his right-hand man, and being escorted by Melody Angel, is struck by a shocking clash of thunder and lightning, and crashes, directly becoming the object to be reconstructed by the Mysterons.

The force broadcasts it's current threat, that they aim to kill all 10 of the worlds' top air-chiefs, who make up the executive Supreme Command of the World Air Force, who want to discuss a plan to dissolve the war of nerves between Earth and the hostile force. They plan on doing so, by holding an International Air Conference at the loneliest location in Europe and the UK; Glen Garry Castle, in Scotland, which the Mysteronised Goddard has chosen to hold the conference to be.

This is however unknown to Colonel White, who is awaiting the approval from Captain Scarlet, that the castle's security is set up and approved. After she brings the delegates to the castle, to start the conference, Symphony Angel is taken prisoner, as is Captain Scarlet,