Kraal invasion of Earth
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The 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)
