When originally aired on Adult Swim’s Toonami in 2013, reception was mixed. Some fans were angry that the filler arc was still continuing. However, over time, the episode has been re-evaluated. On MyAnimeList and Reddit’s r/bleach, users frequently list Episode 309 as one of the “best filler episodes” specifically because of the English dub.

Kyle Hebert’s Aizen has always been silky, intellectual, and condescending. In Episode 309, that composure cracks. Hearing Aizen go from “All according to plan” to screaming in genuine confusion—“Why can’t I feel your Reiatsu?!”—is satisfying. Hebert transitions from god-complex to genuine mortal terror in real time, and the English script sharpens every panicked word.

Fierce Fighting Conclusion! Release, the Final Getsuga Tensho! Episode aired Aug 3, 2013. TV-14. 24m. Bleach – Episode 309 | LuRa's Anime Blog - WordPress.com