The Half-Life game series is based in a science fiction alternative universe, and encompasses the Half-Life games (1, 2, the latter's episodic content, and Alyx) and Portal games (1, 2).
The Half-Life series of games is based in a science fiction alternative universe, and comprises the Half-Life games (Half-Life, Half-Life 2, Half-Life 2: Episode 1, Half-Life 2: Episode 2, and Half-Life: Alyx) and the Portal games (Portal 1, Portal 2).
Plot
The Half-Life series begins in the early 21st century at the fictional Black Mesa Research Facility in New Mexico. The player, a silent scientist named Gordon Freeman, is involved in an experimental analysis of an extraterrestrial artifact; however, the experiment goes horribly wrong, and opens a dimensional rift between Black Mesa and another world called Xen, causing alien monsters to swarm the facility and kill many of its personnel.
Other
The Half-Life name is sometimes stylized as Hλlf-Life, with the Greek lambda sign (λ), referring both to the Lambda Complex, one of the sectors of the Black Mesa Research Facility (in which the original game took place) where the first portal to Xen was created, as well as to the symbol for the decay constant of the half-life of a quantity.
