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StarCraft: Stellar Forces was an unauthorized expansion pack for StarCraft, developed and published by Micro Star. It was published on May 1, 1998 and recalled a few weeks after release.
The game featured 22 single player maps, 32 multiplayer maps and the ability to compete over the Internet or by a local area network.
Stellar Forces was Micro Star's second unauthorized add-on for a Blizzard game. The first was Diablo: Unearthed Arsenal. Blizzard felt that the low quality of Unearthed Arsenal reflected poorly on their product and reputation and thus filed suit to block the release and sale of Stellar Forces. In the end settlement, Micro Star was forced to pay Blizzard an undisclosed statement, recall the game from sale and destroy all remaining copies in its inventory.