One | Piece Episode 18

: Many fans recommend watching it for its heart and humor, though some viewers skip it because it doesn't directly advance the main plot towards the Grand Line.

: While it feels like filler because of its self-contained nature, Gaimon is a canon character who originally appeared in the One Piece Manga and even appears in later cover stories. One Piece Episode 18

: Luffy helps Gaimon by climbing the pillar, only to discover that the chests are empty—his crew had already taken the treasure before leaving him behind years ago. : Many fans recommend watching it for its

: Luffy, Zoro, Nami, and the newly recruited Usopp arrive at a mysterious island rumored to be filled with treasure and inhabited by strange, "hybrid" animals. : Luffy, Zoro, Nami, and the newly recruited

: They encounter a man named Gaimon who has been stuck in a treasure chest for 20 years. He has spent two decades guarding five treasure chests perched on a high rock pillar that he couldn't reach after falling.

: This episode serves as an early philosophical anchor for the series, reinforcing that "treasure" isn't always gold or jewels; it can be freedom, friendship, or a sense of purpose.