When Queen Semiramis and King Sargon arrive in Nineveh, they find a city long weaned from war. Against the will of the city council, Akkadian generals Ezira and Senezon build a defensive army. Nineveh's inhabitants are suspicious of their queen's alliance with the Akkadians, their former foes, and take every opportunity to disgrace them before Semiramis.

Semiramis and Sargon do not suspect that the thunder god Addad is well informed of their preparations. Sowing discord behind the scenes, he stirs the tribes against each other until open conflict erupts in the city. Now Addad's time has come. Even the mighty walls of Niniveh cannot stand before his attacking troops.