Gary Sitterson (Richard Jenkins) is one of the technicians in the control room controlling everything in the cabin in the woods, along with Steve Hadley. He's a high-ranking member of the The Facility, the American branch of the Organization.

He is experienced and skilled at his job. He was able to release a gas that changed Curt's mind in order to split up the group and, when the tunnel failed to collapse, he was able to get it working again and collapse it.

He was killed during the Purge when Dana Polk accidentally stabbed him. His last words were "Kill him."

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