Episode 389: Explosion! The Sunny's Super Secret Weapon: Gaon Cannon
One Piece Episode 389 „Explosion! The Sunny's Super Secret Weapon: Gaon Cannon“. Adapts chapters 494–495. First aired: 2009-02-15.
- Read on in the manga from: Chapter 496 (Volume 51 – The Eleven Supernovas)
- Title (Japanese): 炸裂！サニー号の超秘密兵器ガオン砲
- Title (romaji): Sakuretsu! Sanī-gō no Chōhimitsu Heiki Gaon Hō
- First aired (Japanese): 2009-02-15
- First aired (German): 2010-02-18
- Category: Story
- Arc: Sabaody Archipelago Arc
- Chapters adapted: Chapters 494, pages 17, 19; Chapters 495