The ATMOS factory was located in the London area. It was secretly run by the Sontarans, who operated a cloning tank in the facility and replaced Martha with a clone to infiltrate UNIT. During the Sontaran invasion of Earth, it was the site of a battle between Sontarans troops and UNIT. (TV: The Sontaran Stratagem/The Poison Sky)

Community content is available under CC-BY-SA unless otherwise noted.