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Masoon was a Hyban. It came to Earth in 1814, looking for energy to help its race, since their planet's sun had turned into a collapsed star. To prevent it causing a new Ice Age, the Tenth Doctor brought it to Winter Wonderland in 5113, where he had found Mai Kondo. That planet's orbit had decayed and the temperature had drastically increased, so the Hyban's presence would counteract that, helping the planet and his race. (PROSE: The Frozen)