World of Warcraft: Wrath of the Lich King is the second expansion set for the massively multiplayer online role-playing game(MMORPG) World of Warcraft, following The Burning Crusade. It adds a substantial amount of content to the game world, including the continent of Northrend, home of the titular Lich King, and a new character "hero" class. It was announced on the first day of BlizzCon 2007, 3 August 2007.
Wrath of the Lich King was released on November 13, 2008, selling 2.8 million copies within the first 24 hours of availability. This makes it the fastest selling computer game of all time, beating the record set by the previous World of Warcraft expansion The Burning Crusade, which sold 2.4 million within its first 24 hours. It will be followed be a third expansion set, World of Warcraft: Cataclysm, announced on the first day of BlizzCon 2009.