You're the Weird Creature! Gaimon and His Strange Friends!
S2000E10 - Airdate: 2000-03-15
Runtime: 25 min
With Usopp now in the crew and a new ship, the Going Merry, under their command, the Straw Hats head to an island said to hold a fabled treasure, only to encounter a strange man stuck in a treasure box that has also been looking for this treasure.
Episode details and rating from TVmaze.