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An Earth-like planet was home to large cockroach-like creatures. The sons of Grekk, who also lived there, viewed them and all the other intelligent life forms on the planet as vermin, and had vowed to exterminate them all. One of the cockroaches was held prisoner in the Pit, where he helped the First Doctor engineer an escape, and later restrained Deemon. (PROSE: The Sons of Grekk)