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Space Captain Greg Martin is a character from Thunderbirds Are Go. He served as the second-in-command of the Zero X flight crew during the first and second flights of said spacecraft.

Born in Hawaii, Martin used to work for Paul Travers as a junior flight controller. Following Travers' recommendation that the former join the Zero X training programme, Martin partook in early ground tests, following which he was unanimously selected as the second-in-command.

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