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From The World, Brave New or End of

Half Life 2

(i) GMan Orchestrates The Resonance Cascade, “GMan”, a very mysterious figure at Black Mesa, whose motives seem to be independent of both humankind and of the Combine, triggers a resonance cascade within the Anomalous Materials sector of the Black Mesa complex, by bringing in a specific test sample to be used. His selection of this hazardous material is masked by a system crash, to cut out formal communication between scientists. The resonance cascade rips open space-time and forms a portal between Earth and Xen. Nihilanth’s race sees the dimensional fissure as an escape route. Of course headcrabs and other life trapped on Xen decide to hitch a ride to Earth, for the fun of it. Black Mesa becomes chaos, as the Hazardous Environment Combat Unit, a United States Marine Corps Special Forces division, is brought in to quell the results of the Resonance Cascade, including the elimination of all humans caught in the cross-fire.

This resonance cascade is so immense in nature, that the Combine Empire notices it, turning their interest to what is happening on Earth.

One man in a HEV suit becomes of great interest to G-Man during the incident. Gordon Freeman, a newly assigned scientist in the Anomalous materials lab, shows exceptional skill in dealing with Xen beings and U.S. troops. G-Man’s interest peaks as Freeman navigates through Xen (the Xenians believe that Gordon is just as much of an enemy as the Combine) and defeats the Nihilanth. G-Man is impressed.
Source: The Half Life Story