Zoro is captured by the fishmen after Usopp and Johnny ditch him, and it's revealed that Nami was part of Arlong's crew the entire time. When a group of Fishmen attack Cocoyashi Village, Usopp comes to the rescue.
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E31: The Worst Man in the Eastern Seas! Fishman Pirate Arlong!
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E33: Usopp Dead?! When is Luffy Going to Make Landfall?!
