The sequel to Half-Life, one of the most popular action games ever made, will feature the return of former Black Mesa research associate Gordon Freeman. In Half-Life 2, Freeman can expect to encounter several characters from the previous game, including Barney the security guard and the mysterious G-man, for whom Freeman now works. Freeman will also meet a new female character, Alyx, whose mother was killed during the events of the original game.

During initial installation of Half-Life 2 an internet connection is required to authenticate the game.