One Piece Episode 839
Episode 839 adapts chapters 868–869.
Evil Army - Transformation! Germa 66 · Whole Cake Island arc
Anime
- Episode 839Evil Army - Transformation! Germa 66
Manga chapters
One Pace
- HAPPY BIRTHDAYCovers chapters 867–868
- Under SiegeCovers chapters 869–870
The details
Episode 839 adapts chapters 868–869. Adapting several chapters into one episode is why the anime slowly gains on the manga in raw numbers even while falling further behind in story.