Half-Life (November 1998)

Half-Life tells the story of a recently graduated theoretical physicist, named Dr. Gordon Freeman, who is working on experiments in relation to teleportation technology with other scientists in the Black Mesa Research Facility. Unfortunately, an experiment goes disastrously wrong and aliens from another dimension, also known as Xen, subsequently enter the facility through a dimensional seam! As Freeman tries to make his way out of the ruined facility, he soon realizes that he is caught between two sides: the hostile aliens and a U.S. Marine Corps special operations unit dispatched to cover up the incident by eliminating all organisms in the facility, including every single survivor. Explore the facility as Gordon Freeman, escape the complex alive and discover both the mysterious Xens as well as their portals to other dimensions!