One Piece: Season 1, Episode 473

The Encircling Walls Activated! The Whitebeard Pirates backed into a corner!

Whitebeard enters the battlefield, which raises the morale of his pirates and prompts them to clear the way for him. The Marines try to activate the encircling walls, but the ice prevents them from raising completely. Luffy tries to reach Ace but the large walls activate trapping all the pirates, and while they to break it, it is futile. However they find that there is still a path opened by Oars Jr.'s body, as his blood makes the system less effective.