Bleach: Season 1, Episode 300

1 - 300: Urahara Appears! Stop Aizen!

Kisuke Urahara steps onto the battlefield as Aizen, fused with the Hogyoku, begins his transformation. Urahara’s Kido attack appears ineffective against Aizen, who claims he has complete control over the Hogyoku. But Urahara’s true goal was to turn Aizen’s own spirit energy against himself.