S1·E253 Muramasa's True Identity Revealed
Aired January 12, 2010
Synopsis
6th Division Captain Byakuya Kuchiki defeats Kōga Kuchiki as Muramasa loses control and transforms into a Hollow version of himself. As Ichigo Kurosaki battles Muramasa, several Shinigami and their Zanpakutō Spirits arrive to help.