Zachary Cross Flane

Zachary "Zack" Cross Flane was Second-In-Command of the Walker Expedition.

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He took charge after Captain Walker was killed when their ship crashed on the Krop Tor after encountering the K37 Gem 5, the black hole that the planet was orbiting. Not really wanting the position, he nevertheless successfully dealt with the attack by The Beast and took the survivors away in a shuttle ship. Presumbably, after the Doctor and Rose saved him, he then returned to Earth. (DW: The Impossible Planet/ The Satan Pit)


 * His mention of the Torchwood Archives suggests very strongly that he worked for a future version of the Torchwood Institute, though we do not know if his the other crew members of Sanctuary Base 6 also worked for Torchwood. Alternatively it's possible that Torchwood's existence had simply become common knowledge by the 42nd century much as evidence suggests it had by the 201st Century.