Shortly after Flight 104 takes off, its crew are found unconscious in a storage room. It is discovered that they were drugged by Captain Black and that the airliner is under Mysteron control. On Cloudbase, Colonel White (voiced by Donald Gray) orders the launch of the Angel squadron, who intercept Flight 104 over the Alps. Seeing the empty cockpit, the Angels emit warning smoke to alert Scarlet and Blue. After gaining entry to the cockpit by shooting out the door, the officers discover that Flight 104 is nosediving into the Alps. However, the electricity from a power station breaks the Mysterons' hold on the airliner, and Scarlet and Blue are able to pull out of the dive before they crash into a mountain.