Bleach Episode 165 -

Grimmjow defies Aizen’s orders to keep Ichigo out of the fight. When Ulquiorra Cifer confronts him, Grimmjow uses a specialized item called a Caja Negación to temporarily seal Ulquiorra in another dimension.

Reviewers and fans frequently highlight the "epic" feel of this episode, noting the escalation in fight quality. Grimmjow’s single-minded obsession with defeating Ichigo fairly adds a unique depth to his character. Bleach Episode 165

Grimmjow forces Orihime Inoue to heal a severely injured Ichigo, wanting him at full strength for their duel. Grimmjow defies Aizen’s orders to keep Ichigo out