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'''Z-67''' was a [[nerve gas]] that unravelled the [[DNA]] of [[Zygon]]s. A naval surgeon working for [[UNIT]] developed it after the attempted Zygon invasion of the [[1970s]] or [[1980s|80s]], working on captured Zygons at [[Porton Down]]. [[The Doctor]] took it from UNIT, as well as the formula. ([[TV]]: ''[[The Zygon Invasion (TV story)|The Zygon Invasion]]'') | |||
[[Category:Bioweapons]] | |||
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