Episode 584

"A Duel of Swordplay - Brook vs. the Mysterious Samurai Torso" is the 584th episode of the One Piece anime.

Short Summary
At the lake, Luffy's group have been attacked by Brownbeard and his centaur unit who's job was to intecept and eliminate any would be intruders.

In the lab, Chopper is fighting off the hazmat soldiers who were attempting to get into his, Nami and the children's way. Sanji and Franky continue to fight off their hazmat soldiers and discovered that they look like sheep. Meanwhile outside of the lab, Brook is seen fighting against the sword wielding torso and after trying to talk to it, gives up and ran away from it.

With the G-5 marines and Smoker, the group blasts their way into the island and discovered a hidden river which they quickly entered, unaware that the river was being monitered. At the Lab, a hazmat soldier warns "Master" that the marines have almost reached the harbor. Master says he doesn't want to reveal himself to them but his accomplice says he will greet them. The G-5 Marines finally reached the shore and after Smoker rang the doorbell the marines decided to blow the door open. This was interrupted when the door opened and out came the former supermova, Trafalgar Law. This gotten all the marines except Smoker and Tashigi scared. Tashigi claims he is now part of the Shichibukai since Law also gave the World Government 100 pirate hearts in exchange for the position. Smoker demands to know why Law is on the island since no one is permitted to set foot on the island. Law calmly retorts that Smoker and the marines are not allowed here either.

Anime Notes

 * The fight scene between Brook and the samurai's torso is extended.
 * In the manga, Law first appeared when Smoker and G-5 reached the entrance of the facility. In the anime, Law is shown volunteering to deal with G-5 before they dock their ship.
 * In the manga, Law's former bounty before becoming a Shichibukai was revealed by an infobox. In the anime, Tashigi reveals his former bounty.
 * The following scenes are added in the anime:
 * Usopp trying to talk Brownbeard into not attacking him, Luffy, Zoro, and Robin.
 * Flashback of Law delivering the hearts to the marines.