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The Ruluka Island Arc, also referred to as the Rainbow Mist Arc, is the fourth filler arc in the One Piece anime. This is also the last arc dubbed by 4Kids.


The arc starts off with the Going Merry being chased by a small fleet of Marine ships led by Major Rapanui Pasqua and Isoka. Luffy and his crew barely escape when the Marine's Major accidentally sinks one of his own ships. The crew then make their way towards an island named Ruluka that is ruled by a dictator, who is actually an old pirate, that is over-taxing the people in order to build the Rainbow Tower. The island also has a scientist named Henzo who is researching something called the 'Rainbow Mist'. It is revealed that he is sponsored by the unscrupulous Wetton, mayor of the city and a former pirate. Eventually the Going Merry, with all but Sanji, Nami, and Chopper aboard, gets caught in the Rainbow Mist. Within the Mist, the crew discovers a group of children who have been trapped in the mist for many years. Eventually they find a way out, but when the Straw Hats reemerge, they cannot find the children. The marines come to "arrest" them, which are apparently the kids, but say there is no room on their ship due to Wetton and his gang being locked up. The Straw Hats leave the island, and then a ship falls from the sky.

4Kids version[]

This was the last arc of the One Piece anime dubbed by 4Kids, as well as being the only separate filler arc that they dubbed (as both the Warship Island Arc and Goat Island Arc were skipped, along with four of the five Post-Arabasta filler episodes). The following edits were made:

  • In the first episode, the opening clips, where the Straw Hats are chased by Rapanui Pasqua, were almost completely removed.
  • Soldiers' guns were, as traditionally, recolored (to blue).
  • Numerals have been edited out from the "Rainbow Mist" books.
  • Ape's Concert was renamed to "Wrecker's Reef."
  • Lake was given a distinctly Australian accent.


  • Unlike in the manga, where the Going Merry was heavily damaged at the end of the Arabasta Arc by Hina's attack, in the anime, this arc depicts how the Going Merry began to severely fall apart, seeing it get blasted out of Ape's Concert with too much force for the ship to handle, causing the figurehead to break off, and have one of the masts snap in two and collapse on a railing, tearing it apart as well. Then, the ship is patched up in Ruluka just before heading out.
    • The Merry being shot out of Ape's Concert with an explosive blast bears an uncanny, yet unrelated resemblance to the Coup de Burst function its successor, the Thousand Sunny, would have, a ship built strong enough to handle the shock from such force and weaponize it.

Plot Holes[]

  • When the Straw Hat Pirates learned that Momonosuke and several of his companions are actually from the past in the Wano Country Arc which was the first canonical use of time travel in the official canon, they are surprised by this, with Zoro making a comment on this concept, [1] even though he and several of the other Straw Hat Pirates had traveled into the Rainbow Mist, and encountered several people from the past during this arc. [2]
  • Nami shows no concern for Rongo's well-being when he was held at gunpoint, which at the time the true depths of Nami's protective nature towards children had not been fully explored yet in the manga, as this was first fully seen in the Punk Hazard Arc, where Nami demonstrated a strong desire to help the children stuck at Punk Hazard despite this being their first meeting, to the point of refusing to leave until they helped them.

Arc Navigation[]

Ruluka Island Arc
Anime Episodes
139 140 141 142 143

Site Navigation[]

  1. One Piece Manga and Anime — Vol. 91 Chapter 920 and Episodes 910911.
  2. One Piece Anime — Episode 140, Several of the Straw Hats explore the Rainbow Mist.