Halo is a legendary series of games (mostly shooters), published by Microsoft Studio since 2001. The plot of these games tells about the distant future, where humanity is trying to resist aliens. The player takes control of the Master Chief - the "Spartan". His adventures begin with Halo: one of the stations created to fight the Flood race, which is trying to consume space.
Despite the fact that most of the games in the Halo series are shooters, the isometric action game Halo: Spartan and Halo Wars - a real-time strategy - have crept into the series. All of them talk about the endless struggle of humanity with alien races: the Floods and the entire alien alliance - the Covenant.