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S1 E32: Witch of Cocoyashi Village! Arlong's Female Leader!

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.

Air date	Jul 19, 2000
Runtime	25 minutes
TMDB rating	★ 7.5/10