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The first Kraal invasion of Earth was thwarted by the Fourth Doctor. (TV: The Android Invasion)
History
Background
At some point in 1881, Jenny Flint helped the Doctor foil a Kraal plot to replace Edward VII with a mechanical duplicate. (PROSE: Madame Vastra)
The Kraals lived on a doomed world, evolving due to exposure to radiation over a dozen generations. (AUDIO: The Oseidon Adventure) Oseidon was becoming more radioactive, reaching critical levels which the Kraals could not withstand. (TV: The Android Invasion)
The Invasion
The Kraals abducted a human astronaut, Guy Crayford, and scanned his brain. Styggron tailored his androids to look like the inhabitants of Devesham, an English village, which was also produced, along with the adjoining Space Defence Station, as a training ground on Oseidon. After testing these androids, the Kraals planned to send them to Earth with a deadly virus to infect and kill all of the humans.
The Fourth Doctor used the radar dishes at the real Space Defence Station to disable the androids there and then boarded the rocket Styggron had used. Crayford confronted the Kraal about his lies, having promised that no humans would be harmed. Styggron killed him but was thrown by an android of the Fourth Doctor onto the steriliser containing the virus. He was infected but managed to fire his gun, destroying the android, before he died. (TV: The Android Invasion)