Shinigami and Quincy! The Reviving Power!

After knowing Kariya's real evil plan, Ichigo finally achieves Bankai in the real world. He and Kariya start fighting, but they are interrupted by Ishida's surprising entrance - along side with the gang (Chad, Inoue, and Rukia). Later on, it becomes clear why Kariya kidnapped Ishida at the beginning. Ishida does something surprising causing the Bountos to pass the portals to Soul Society, but he explains why. The episode ends with everyone deciding to follow the Bountos to Soul Society and defeat them there.

Next episode

S05E01 - Enter the World of the Shinigami, Again