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Jason Clearfield was an Earth scientist.
During an experiment with a teleportation device near Ringstone, England, on 21 March 1944, a Wyrrester was transported to Earth. It was destroyed in a Nazi bombing raid, but it influenced Clearfield's mind and physiology, making him more intelligent and nearly immortal.
He spent the next 70 years preparing a new but modified teleportation device to allow the Wyrresters to return to Earth. He also experimented on insects to create hosts for the Wyrresters when they did arrive. The invasion was meant to occur on 21 March 2014 but was narrowly averted through the efforts of the Twelfth Doctor, Clara, and several others. (PROSE:The Crawling Terror)