Cosmic terror infects the U.S. government and the companies that profit from it. 

Delta Green: The Complex offers 21 new dossiers for federal agencies and important contractors to enhance your Delta Green campaign. Each dossier describes the entity’s budget, operatives, organizational structure and history, mandate, areas of friction with other agencies, suggested professions for Delta Green agents, and what it’s like to work there. 

The Complex gives deep and playable details for both the Handler and the Agents. It covers the ATF, Booz Allen Hamilton, the Coast Guard, Consolidated Analysis Center Incorporated, Constellis Group, Customs and Border Protection, DARPA, the Defense Intelligence Agency, FEMA, the IRS, Lockheed Martin, NASA, the National Nuclear Security Administration, the National Counterterrorism Center, the National Geospatial Intelligence Agency, the National Parks Service, the National Reconnaissance Office, the NSA, the Office of Naval Intelligence, the RAND Corporation, and the Secret Service. 

The Complex supplements Delta Green: The Role-Playing Game, one of the most acclaimed RPG series of all time.