Some time before the 30th century, the Klepton home world began moving closer to its sun, becoming hotter and drier. In search of a new home, they learned of Earth and brought a spaceship crewed by two human astronauts to their world. The humans refused to help the Kleptons plan an invasion and were imprisoned. Shortly afterwards, the First Doctor, John and Gillian arrived on the planet and soon were also captured by the Kleptons. The travellers helped the astronauts escape and flee the planet. (COMIC: Prisoners of the Kleptons)