: This is considered "canon filler" or "mixed canon"—while it is not adapted from the main manga chapters, it expands on character backstories in a way that remains consistent with the original story.
: The episode delves into Chopper's history on Drum Island, specifically the creation of his Rumble Ball —a drug that enhances his Devil Fruit powers. One Piece Episode 131
One Piece Episode 131, titled , is the first episode of the Post-Alabasta Arc . It originally aired on November 3, 2002. Episode Summary : This is considered "canon filler" or "mixed