Well, the normal World of Warcraft story line has now been expanded to encompass Northrend, and the story of the Lich King that rules it and threatens to bring destruction to the whole of Azeroth. The new expansion's lore begins five years ago with the disappearance of the heir to the throne of Lordaeron into Northrend, with the unholy union between Arthas' and Ner'zhul, and one heck of an eerie silence and darkness that has swept the lands of Azeroth. Suddenly, the Lich King has risen and has assembled his forces to move on the armies of both the Alliance and the Horde, threatening to wipe all races from the map. As one of the heroes of Azeroth, you will now be fighting against this massive threat and struggling to bring down the mighty Lich King's minions and the king himself.
For those who love to read the lore behind the video games, World of Warcraft and Blizzard don't disappoint here. You'll find more than you ever really wanted to know about the Lich King and Northrend on the World of Warcraft web site, www.worldofwarcraft.com, and you can purchase books and other literature that will go even more in depth into the story line. So, in terms of the story line behind the game, I have to give it a 5 out of 5.