Seat of God Plan

The is Sōsuke Aizen's plan to take up the "throne of god", named by Tadoku Getsueikirite, who also played a major role in carrying out the plan. The culmination of this plan is the War of the Worlds. The Soul Society sees this plan as an affront to the balance of the souls and plans to stop it before Aizen can full enact the plan.

The Plan
Aizen created the plan before the existance of the, some thousand years before the series' beginning.

Progress of the Plan
Though Aizen succeed in the creation of an Arrancar army, headed by his, as well as the invention and eventual completion of his own , his plans were put on hold upon the timely intervention of during the , resulting in Aizen gaining immortality, but being imprisoned in the depths beneath Soul Society. However, after his imprisonment, his plans were carried on by his subordinate, Tadoku Getsueikirite, who successfully weakened the Gotei 13, though he himself was thwarted by Raian Getsueikirite.

Nevertheless, years later, Tadoku, under the guise of Akujin, returned - bringing with him an army of his invention; the Impero Nascosto. Through the War of the Worlds, a war started by Tadoku's Impero, the latter was able to free Aizen from his imprisonment and bring about the next phase of their plan.

Trivia

 * This plan has involved the manipulations of most of the character's in the story's pasts.