Warcraft III: The Frozen Throne is a real-time strategy computer game developed for Microsoft Windows, Mac OS and Mac OS X by Blizzard Entertainment. It is the official expansion pack to Warcraft III: Reign of Chaos, requiring the ownership of Reign of Chaos to play. Released in stores worldwide in multiple languages beginning on July 1, 2003, it includes an additional hero for each race and two to three new units per race, four campaigns, five neutral heroes (an additional neutral hero was added April 2004 and two more were added in August 2004), the ability to build a shop and various other improvements such as the ability to queue upgrades. Blizzard Entertainment regularly releases patches for the game to fix bugs, add new features, and balance multiplayer play.
Set a number of months after the events of Warcraft III, The Frozen Throne continues some of the loose ends of the original game, and also spins off some new plots of its own and paves way for the new conflict of World of Warcraft. The storyline follows a different order from the first game. The first campaign is that of the Sentinels (Night Elves), followed by the Blood Elves (formerly High Elves), and finally the Scourge (Undead). The Orc mini-campaign follows a different storyline, which explores their lives after the war against the Legion, and sets the story for the next game.