Gordon Freeman

Gordon Freeman of Half-Life is a theoretical physicist who is forced to defend himself and his fellow beings against hostile aliens and other enemies following an experiment gone wrong. Freeman and his team perform an experiment that goes horribly wrong. As a result, the space time continuum is ruptured, allowing alien lifeforms to enter the Black Mesa facility. They immediately begin killing any humans they can find. Freeman finds himself hunted by two groups: the invading aliens and the Hazardous Environment Combat Unit, a military cleanup team that has been sent to contain the situation, silencing aliens and surviving personnel alike.