Adventure in the Ocean's Navel
The Straw Hats encounter a city in the middle of a whirlpool, called the Ocean's Naval, that is being destroyed by giant monsters. These monsters supposedly protect a treasure capable of granting wishes, but in the process of defeating these guardians, the crew ends up releasing another evil.
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More from this season
S0 E1
Contingency Plan. Complete Summary One Piece
This is the first recapitulation episode, covering the first five episodes with only the difference being that the episode follows the manga storyline and begins with Luffy and Shanks at the bar. Also, in the ending, the current Straw Hats have a small conversation about their goals.
S0 E3
Open Upon the Great Sea! A Father's Huge, HUGE Dream!
Three children, Amanda, Milia and Holy, are being held captive on a pirate ship. Their father, who was a pro treasure hunter, told them the whereabouts of a great treasure. Luffy and crew try to save them but their opponents have a dangerous ability in their sleeves.
S0 E4
Protect! The Last Great Performance
It is the last performance of a great actor and playwright, but several actors suddenly quit. Luckily, the Straw Hats offer to take their place. However, the quitting actors turns out to be more than a coincidence when they meet a Marine with a grudge against the playwright.
S0 E5
The Detective Memoirs of Chief Straw Hat Luffy
In an alternate reality world that takes place in 19th century Japan, Luffy acts as a member of the secret police. The story is divided into two halves: in the first, Buggy the Clown makes trouble in the town where Detective Luffy is stationed, and in the second a mysterious girl named Vivi appears. These stories feature cameos from several minor characters in the normal series.