One Piece

One Piece (1999 – ...)

1999 • 23 seasons • Action & Adventure, Comedy • TV-14

On August 7, 2026

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Episode 591 — Chopper's Fury! The Master's Inhumane Experiment!

Season 15 • One Piece

Released: 2013-04-14 • Action & Adventure/Comedy/Animation

66%

User score

The giant children fly into a mysterious rage, and Chopper discovers the true reason for their unusual condition! Meanwhile, Zoro, Brook, and Sanji cross paths with a dangerous duo!

Episodes

Episode 581
The Straw Hats Stunned! Enter: A Samurai's Horrifying Severed Head!
2013-01-20

Episode 582
Startling! The Secret of the Island Is Finally Revealed
2013-01-27

Episode 583
Save the Children! The Straw Hats Start to Fight!
2013-02-03

Episode 584
A Swordplay Showdown! Brook Vs. The Mysterious Torso Samurai!
2013-02-10

Episode 585
The Warlord! Trafalgar Law
2013-02-24

Episode 586
In a Real Pinch! Luffy Sinks into the Ice-cold Lake!
2013-03-03

Episode 587
A Collision! Law vs. Vice Admiral Smoker!
2013-03-17

Episode 588
Meeting Again After Two Years! Luffy and Law!
2013-03-24

Episode 589
The Worst in the World! A Scientist of Terror - Caesar!
2013-03-31

Episode 590
History's Strongest Collaboration vs. Glutton of the Sea (II)
2013-04-07

Episode 591
Chopper's Fury! The Master's Inhumane Experiment!
2013-04-14

Episode 592
To Annihilate the Straw Hats! Legendary Assassins Descend!
2013-04-21

Episode 593
Save Nami! Luffy's Fight on the Snow-Capped Mountains!
2013-04-28

Episode 594
Formed! Luffy and Law's Pirate Alliance!
2013-05-05

Episode 595
Capture M! The Pirate Alliance's Operation Launches!
2013-05-12

Episode 596
On the Verge of Annihilation! A Deadly Monster Comes Flying In!
2013-05-19

Episode 597
An Intense Battle! Caesar Exercises His True Power!
2013-05-26

Episode 598
The Samurai that Cuts the Fire! Kin'emon of Foxfire!
2013-06-02

Episode 599
Shocking! The True Identity of the Mystery Man Vergo!
2013-06-09

Episode 600
Save the Children! The Master's Evil Hands Close in!
2013-06-16

Episode 601
Shaking Up the New World! Caesar's Horrendous Experiment!
2013-06-23

Episode 602
The Deadliest Weapon of Mass Destruction in History! Shinokuni!
2013-06-30

Episode 603
Launching the Counter Attack! Luffy and Law's Great Escape!
2013-07-07

Episode 604
Get to Building R! The Pirate Alliance's Great Advance!
2013-07-14

Episode 605
Tashigi's Tears! G-5's Desperate Breakthrough Plan!
2013-07-21

Episode 606
The Treacherous Vice Admiral! Demon Bamboo Vergo!
2013-07-28

Episode 607
A Fierce Battle Gets Heated! Luffy vs. Caesar!
2013-08-11

Episode 608
A Mastermind Underground! Doflamingo Makes His Move!
2013-08-18

Episode 609
Luffy Dies from Exposure?! The Spine-chilling Snow Woman Monet!
2013-08-25

Episode 610
Fists Collide! A Battle of the Two Vice Admirals!
2013-09-01

Episode 611
A Small Dragon! Momonosuke Appears!
2013-09-08

Episode 612
A Deadly Fight in a Blizzard! The Straw Hats vs. the Snow Woman!
2013-09-15

Episode 613
Showing Off His Techniques! Zoro's Formidable One-Sword Style!
2013-09-22

Episode 614
To Save Her Friends! Mocha Runs at the Risk of Her Life!
2013-09-29

Episode 615
Brownbeard in Grief! Luffy Lands a Furious Blow!
2013-10-06

Episode 616
A Surprising Outcome! White Chase vs. Vergo!
2013-10-13

Episode 617
Caesar's Defeat! The Powerful Grizzly Magnum!
2013-10-20

Episode 618
Raid! An Assassin from Dressrosa!
2013-10-27

Episode 619
Running Wild! Invincible General Franky!
2013-11-03

Episode 620
A Critical Situation! Punk Hazard Explodes!
2013-11-10

Episode 621
Capture Caesar! General Cannon Blast!
2013-11-17

Episode 622
A Touching Reunion! Momonosuke and Kin'emon!
2013-11-24

Episode 623
It's Time to Say Goodbye! Leaving Punk Hazard!
2013-12-01

Episode 624
The G-5 Wiped Out! Doflamingo's Sudden Attack!
2013-12-08

Episode 625
Intense! Aokiji vs. Doflamingo!
2013-12-15

Episode 626
Caesar Goes Missing! The Pirate Alliance Makes a Sortie!
2013-12-22

Episode 627
Luffy Dies at Sea?! The Pirate Alliance Comes Apart!
2014-01-05

Episode 628
A Major Turnaround! Luffy's Angry Iron Fist Strikes!
2014-01-12

Episode 629
Startling! The Big News Shakes Up the New World!
2014-01-19

Episode 630
Explore! A Kingdom of Love and Passion: Dressrosa!
2014-01-26

Episode 631
Full of Enthusiasm! The Corrida Colosseum!
2014-02-02

Episode 632
A Dangerous Love! The Dancer Girl: Violet!
2014-02-09

Episode 633
A Formidable, Unknown Warrior! Here Comes Lucy!
2014-02-16

Episode 634
A Pirate Noble! Cavendish!
2014-02-23

Episode 635
The Fateful Reunion! Bellamy the Hyena!
2014-03-02

Episode 636
A Super Rookie! Bartolomeo the Cannibal!
2014-03-16

Episode 637
Big Names Duke It Out! The Heated Block B Battle!
2014-03-23

Episode 638
A Deadly Blow! The Astonishing King Punch!
2014-03-30

Episode 639
The Fishing Fish Strike! Across the Deadly Iron Bridge!
2014-04-06

Episode 640
Explore! Fairies' Island - Green Bit!
2014-04-13

Episode 641
The Unknown World! The Tontatta Kingdom!
2014-04-20

Episode 642
The Stratagem of the Century! Doflamingo Makes His Move!
2014-04-27

Information

Episode air date	14.04.2013
Episode runtime	24 min
Episode rating	6.57
Genres	Action & Adventure / Comedy / Animation
TMDB series rating	8.8
IMDb series rating	9.0
Series status	Returning series
Age rating	14+
Country	JP

Trailer

Additional videos

Happy 26th Anniversary to ONE PIECE [Subtitled]

Happy 26th Anniversary to ONE PIECE [Subtitled]

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Cast

Mayumi Tanaka
Monkey D. Luffy (voice)

Kazuya Nakai
Roronoa Zoro (voice)

Mari Yaguchi
요코 (성우)

Akemi Okamura
Nami (voice)

Kappei Yamaguchi

Kappei Yamaguchi
Usopp (voice)

Hiroaki Hirata
Sanji (voice)

Ikue Otani
Tony Tony Chopper (voice)

Yuriko Yamaguchi

Yuriko Yamaguchi
Nico Robin (voice)

Kazuki Yao
Franky (voice)

Katsuhisa Houki

Katsuhisa Houki
Jinbe (voice)

Cho
Brook (voice)

Reiko Takagi
Jewelry Bonney (voice)

Yohei Tadano
Dr. Vegapunk (voice)

Hideyuki Tanaka

Hideyuki Tanaka
돈키호테 도플라밍고 (성우)

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