100,000 years ago, the Didact served as a military commander of the Forerunners, a powerful race of aliens who were at war with ancient humans. But humans weren't the only threat to the Forerunners. Besieged by an unstoppable, parasitic enemy known as the Flood, the Forerunners desperately tried many radical plans to save themselves, and the rest of the universe, from extinction.
Since the Flood only devoured sentient organic life, the Didact’s plan was to defeat them by creating an army of advanced robotic soldiers – the Prometheans. But before he could use his synthetic creations to destroy the Flood, the Didact was sealed inside a Cryptum, locked in suspended animation, and exiled to the artificial world of Requiem.
100,000 years later, in Halo 4, the Master Chief and Cortana discover Requiem, and are tricked into releasing the Didact from his prison! With the Flood threat ended by the Master Chief in Halo 3, the newly awakened Didact now turns his army of Prometheans upon his ancient enemy – humanity!
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