Located in Dun Morogh, the technological wonder known as Gnomeregan was the gnomes' capital city for generations, until it was infested by a hostile race of troggs. In a frantic attempt to destroy the invaders, the gnomes' leader, High Tinker Gelbin Mekkatorque, acted on the suggestions of his closest advisor, Mekgineer Thermaplugg, and ordered that the city be flooded with radioactive gas. Gnomeregan was turned into an uninhabitable wasteland, and those gnomes who didn't perish fled their home.

Years later, Thermaplugg has been implicated as the mastermind behind the trogg invasion, and Mekkatorque has led the remnants of his people back to Gnomeregan. Pieces of the great city have been reclaimed by their former citizens, but the brave gnomes who now dwell in what they've dubbed "New Tinkertown" have yet to accomplish their highest goals: to extract as many of their fellows as possible from the irradiated depths of Gnomeregan, and to put a stop to Thermaplugg, who still rules the ruined city as its techno-overlord.