During the Great War, Iacon held out various Decepticon attacks until at the final days of the war, where Decepticon forces began to overrun the city, killing all the Autobot defenders. But before Iacon fell, various relics were jettisoned into deep space where they are safe from Decepticon reach. Iacon was destroyed eventually as the Decepticons invaded the city and the Hall of Records.
When the Autobots won the Great War, Bulkhead began rebuilding Iacon though he was severely hampered by the fact that he had to use Vehicons as workers. The Nemesis was parked above Iacon where Bumblebee spent his time interrogating Decepticon prisoners.