The Unleashed Swan! A Reunion with Bon Clay!

Magellan's escort delivers Hancock to the deepest cellblock, where Ace is confined. When the inmates turn loud and crude toward the Snake Princess, the warden balloons into a churning mass of toxin and summons a three-headed Hydra of poisonous dragons. The heads tear into the surrounding cages, terrifying the captives and leaving one of them poisoned to the brink of death. While that horror unfolds, Hancock leans close and tells Ace that his younger brother has slipped into the Great Prison to come for him, a truth that stuns the captive commander.

On a higher floor, Luffy is cornered by the Sphinx once more, narrowly slipping a Seastone net. A figure strikes a ballerina's pose and calls out as though he were Zoro, only to drop the disguise: it is Bentham. The okama who once stood at Luffy's side during the Alabasta crisis cripples the beast with Swan Arabesque, and the reunited friends batter the Sphinx together before resolving to head further down.

Magellan unveils his signature Hydra for the first time, poisoning the rowdy prisoners ringing Ace's cell. Hancock manages to pass along the news that Luffy has come to free Ace, startling him and catching Jinbe's attention. Sadi-chan, the whip-cracking commander of the Demon Guards, makes her debut and has the prison sealed shut. Bentham, who had thrown himself in harm's way to misdirect Hina, is shown alive and well, and after impersonating Zoro he rejoins Luffy. The pair down the Sphinx and turn toward the fifth floor, each driven by someone they hope to find there.

This installment continues the Impel Down Arc of the One Piece anime. Its preview segment runs very short, since announcements for the tenth feature film and the series' tenth anniversary coincided with its broadcast. It is also the last episode in which Daisuke Gori voiced Jinbe before his death; Katsuhisa Hoki assumed the role beginning with Episode 440.