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Roman Groom (2034-2059) was an American member of the group on Bowie Base One. He was the designer and operator of the robot Gadget and gave it its "comedy" persona, though this backfired on him when the Tenth Doctor modified the robot to move at a considerable speed, causing Roman significant pain in the process.

A child genius, Roman had multiple degrees by age seventeen when he decided to sign up with NASA.

He was the youngest member of the Bowie Base mission, noted for an instinctive talent for mechanics. While escaping from Bowie Base One, he was infected by the Flood when a single drop of water fell on his cheek. He warned Adelaide Brooke and the remaining members to run before he transformed. If anything remained of Roman, it was killed when Adelaide blew up the entire base. (TV: The Waters of Mars)