Level 23 is a level and area of Stargate Command. In 1999, when the base was infiltrated by the Stragoth, they closed off the level, in order to covertly capture SGC personnel and hook them up to scanning devices, in order to infiltrate Earth with the mimetic devices. For the unsuspected personnel, the mimicked aliens would lock down the area, with the cover story of a Tetrachloroethylene spill. (SG1: "Foothold")

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