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Walker was the captain of the Sanctuary Base 6 crew. He signed a deal with Macmillin to get back the energy-saving Krop Tor. He was killed by an Ood when he got The Beast's key. It can be presumed that he named the expedition after himself. (TS: Tardisode 8)
Walker died when the expedition's ship crashlanded. Zachary Cross Flane took over as acting captain. (DW: The Impossible Planet)