Episode 591: Chopper Enraged - Master's Tyrannical Experiments
One Piece Episode 591 „Chopper Enraged - Master's Tyrannical Experiments“. Adapts chapter 665. First aired: 2013-04-14.
- Read on in the manga from: Chapter 666 (Volume 67 – COOL FIGHT)
- Title (Japanese): チョッパー激怒 M非道なる実験
- Title (romaji): Choppā Gekido - Masutā Hidōnaru Jikken
- First aired (Japanese): 2013-04-14
- First aired (German): 2018-04-12
- Category: Story
- Arc: Punk Hazard Arc
- Chapter adapted: Chapters 665