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Gern was a Cyberman from the planet Mondas, and was part of the second Cybermen force which invaded the Snowcap Base in Antarctica in December 1986 with the intention of detonating a Z-Bomb located in its missile silo. Gern and the other Cybermen were eliminated during the invasion when their home planet and power source, Mondas, disintegrated. (TV: The Tenth Planet)