"Insurrection was the first add-on pack released for StarCraft. Although developed and published by Aztech New Media, it is authorized by Blizzard Entertainment. It was released for the PC on 31 July 1998. The expansion's story focuses on a Confederate colony during the course of the first campaign of StarCraft. As in StarCraft, the player takes control of each race in three separate campaigns. In the first campaign, Terran colonists attempt to defend themselves from the Zerg invasion of the sector as well as from a rising insurgency. The second campaign has the player directing a Protoss task force sent to clear the Zerg infestation of the colony by any means necessary. In the final campaign the player assumes the role of a Zerg cerebrate, whose goal is to crush all opposition on the surface. The expansion contains around 30 new campaign missions and over 100 new multiplayer maps, although it does not include new content such as units and graphical terrain tilesets. Insurrection was criticized by reviewers for lacking the quality of the original game and it is not widely available. Although the add-on is authorized by Blizzard Entertainment, they offer no comment on support or availability of the game.
Source: Wikipedia, "StarCraft_(series)," available under the CC-BY-SA License.