WarCraft III: Reign of Chaos
After years of languishing in captivity, the remaining orcs on Azeroth were liberated by a former slave named Thrall. This young shaman and his reformed Horde fled to the continent of Kalimdor to escape the invasion of the Burning Legion, a demonic army that sought to ravage all of Azeroth. To weaken the world's defenses, the Legion unleashed a horrifying new weapon: the undead Scourge. Prince Arthas Menethil of Lordaeron fought bravely to protect his lands from this dreaded enemy, but his fear and desperation led him to join forces with the Scourge's mysterious leader, the Lich King. On Kalimdor, Thrall's Horde set aside old hatreds and united with other races to thwart a massive Legion assault helmed by the demon lord Archimonde. At great cost, the unlikely union of humans, night elves and orcs defeated their enemies atop sacred Mount Hyjal.
WarCraft III: The Frozen Throne
While the armies of humans, orcs, and their allies recovered from their battle against the Burning Legion, Arthas Menethil - now a Death Knight - slaughtered the living denizens of Azeroth's Eastern Kingdoms in the name of the Scourge. But new forces emerged that threatened to destroy Arthas and his minions: the banshee Sylvanas Windrunner rebelled, creating a splinter faction of undead known as the Forsaken, and the demon-tainted night elf Illidan Stormrage sent his armies to the icy continent of Northrend to strike at the Lich King. Arthas rushed to his master's defense and defeated Illidan, who fled to Outland in shame. At last close to the seat of the Scourge's power, Arthas did the unthinkable, and willingly merged his own spirit with that of the Lich King.