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October 7 - episode 291 - Desperate Struggle with Aizen! Hirako, Shikai!
October 14 - episode 292 - All Out War! Aizen vs. Shinigami
October 21 - episode 293 - Blade of Hatred! Hitsugaya, Enraged!
October 28 - episode 294 - The Sealed Genryƫsai
(Source: Anime News Network, NarutoFan forums)