Materialising in outer space, the TARDIS is attacked by a missile fired from the dark side of the moon.

Back on Earth, the newly-formed United Nations Intelligence Taskforce, led by Brigadier Lethbridge-Stewart, is disturbed by a series of UFO sightings over Southern England.

Meanwhile, a large consignment of mysterious crates is delivered to the headquarters of International Electromatix, the largest computer and electronics firm in the world.

Three seemingly unconnected events - but in reality the preparations for a massive Cyberman invasion of Earth with one aim - the total annihilation of the human race.

Novelization of the Doctor Who TV series; eight episode story "The Invasion" (1968), script by Kit Pedler.