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Walker was the captain of the Sanctuary Base 6 crew. He signed a deal with McMillen to get the power source preventing Krop Tor from falling into the black hole K37 Gem 5. (WC: Tardisode 8) Walker died when the expedition's ship crash landed, leaving Zachary Cross Flane as acting captain of his expedition. (TV: The Impossible Planet)
- For a gallery of images depicting Walker (Tardisode 8), see Walker (Tardisode 8)/Gallery.
