Half-Life was critically acclaimed for its storytelling and level design. An 'anti- mass spectrometer' experiment conducted on Xen matter causes a Resonance Cascade disaster that allows aliens to invade Earth, and is the catalyst for the events of the series.

While the facility ostensibly conducts military-industrial research, its secret experiments into teleportation have caused it to make contact with the alien world of Xen, and its scientists covertly study its life-forms and materials. Located in the New Mexico desert in a decommissioned Cold War missile site, it is the former employer of Half-Life's protagonist, Gordon Freeman, a theoretical physicist, and a competitor of Aperture Science. It also features in the wider Half-Life universe, including the Portal series. The Black Mesa Research Facility (also simply called Black Mesa) is a fictional underground laboratory complex that serves as the primary setting for the video game Half-Life and its expansions, as well as its unofficial remake, Black Mesa. Gordon Freeman, Barney Calhoun, Isaac Kleiner, Eli Vance, Wallace Breen, Arne Magnusson, Rosenberg, Gina Cross, Colette Green, Richard Keller

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