Warcraft III: Reign of Chaos is a fantasy themed real-time strategy game with role playing elements set on the world of Azeroth. After the defeat of Orcish horde at the hand of the Alliance in the second war and the destruction of the Dark portal, the remaining orcs were rounded up and put in internment camps. The game starts with the Orcs being freed by a new warchief from their internment camps and leave for a new continent across the sea. The Humans are troubled by a mysterious disease that turns people into living dead. Meanwhile the undead are preparing for a way to let their Demon masters enter the world of Azeroth.

Warcraft III: The Frozen Throne is the first official expansion to Warcraft III: Reign of Chaos. The game takes place not long after the events depicted in the latter. The Night Elves have retreated to their forest to heal the war-torn earth, the Orcs have finally found a home, the Humans have moved on since their homeland is now a plague-stricken infested wasteland, and the Undead, having been defeated in the battle of Mount Hyjal move on to the frozen north. A new evil has awakened and is threatening the land.

The expansion features one new hero per race along with several 'neutral' heroes that can be recruited by any race, several new units for each race as well as neutral races, new tile sets, a player-built shop that can be used to equip heroes with items, and an all new campaign.