Carrington (The Ambassadors of Death)

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General Carrington was a British military officer and the head of the Space Security Department. He had previously been an astronaut on Mars Probe 6, where an alien accidentally killed Jim Daniels, a member of his crew. Afterwards, Carrington worked with Sir James Quinlan to capture three of the aliens and use them to start a war between Earth and the aliens. Carrington was eventually stopped thanks to the Doctor's efforts. (DW: The Ambassadors of Death)