Even when he's no longer the main antagonist that Ichigo has to face, Aizen has been brought back in the Thousand Year Blood War arc. He is approached by both Yhwach and Captain Commander Shunsui ...

Although Ichigo was able to survive at the end of it all, their fight could have had a much more fatal ending had Aizen not helped out. It’s revealed that in the brief moment where Yhwach had ...

Elsewhere, Ichigo and Renji had managed to reach Hooden ... As the fight proceeds further, Aizen, Tosen, and Gin observe it from afar. This is when they notice a Quincy coming in to help Isshin.