StarCraft II is a trilogy of military science fiction real-time strategy video games currently under development by Blizzard Entertainment as a sequel to the award-winning 1998 video game StarCraft. StarCraft II, originally envisioned as a single game, was announced to be a trilogy at BlizzCon 2008, consisting of the base game and two subsequent expansion sets, entitled Wings of Liberty, Heart of the Swarm and Legacy of the Void respectively.