The Daemervoids were a race of giant winged insects who considered an invasion of Earth.
The final stage of their plan was to assess Earth's defences, which they did by arranging a 'lightning bolt' to render the crew of a sub-orbital jet unconscious. This let them kidnap the President of Earth and use a mind-probe on her. The Doctor's intervention however meant that the mind-probe picked up visuals from an in-flight movie device fitted around the President's neck. It falsely showed the Earth to be too well defended for an invasion. The Daemervoids returned the President to the jet and retreated hastily. (COMIC: Air Force Gone)