As the story progresses, Freeman encounters various military groups and mysterious characters. This sends everything into an expected chaos, and Freeman must escape the facility while fending off the horrors from the other dimension. When an experiment goes wrong, Freeman and his cohorts accidentally rip open a portal to another dimension. You assume the role of Gordon Freeman, a theoretical physicist who works at the aforementioned facility.
The story of Half-Life starts at the Black Mesa Research Facility in New Mexico, where highly classified scientific experiments take place.
