The Mysterons present to Spectrum their new act of avenge; to kill one of the Angel pilots, and with Destiny on vacation, she is their apparent target, so Captains Scarlet and Blue fly to Paris to pick her up and accompany her back to Cloudbase.

On the way back, 3 brand new, un-painted Angel Interceptors, reconstructed from those that were subsequently destroyed in a scorching warehouse fire, open fire upon the Spectrum personnel, but a daring dynamic and enthralling aerial dogfight between the Mysteron aircraft and the real Spectrum Angels ensures, testing Melody's Rhapsody's and Harmony's outstanding skills and training to the maximum.