Urahara confronts Aizen about his hollowfication research but ultimately Tsukabishi is unable to capture him. Meanwhile, after being transported back to the 12th Squad headquarters Urahara decides to use Hougyoku to save Shinji and the others. Urahara and Tsukabishi are then arrested by Central 46 and blamed for the hollowfication experiments. However, before their sentences can be carried out Yoruichi appears and helps them escape to the real world. (thetvdb.com)