Homeworld is a real-time strategy video game developed by Relic Entertainment and published by Sierra Studios on September 28, 1999, for Microsoft Windows. Set in space, the science fiction game follows the Kushan exiles of the planet Kharak after their home planet is destroyed by the Taiidan Empire in retaliation for developing hyperspace jump technology. The survivors journey with their spacecraft-constructing mothership to reclaim their ancient homeworld of Hiigara from the Taiidan, encountering a variety of pirates, mercenaries, traders, and rebels along the way. In each of the game's levels, the player gathers resources, builds a fleet, and uses it to destroy enemy ships and accomplish mission objectives. The player's fleet carries over between levels, and can travel in a fully three-dimensional space within each level rather than being limited to a two-dimensional plane.