Episode 408

"Landing! No-Boys-Allowed Island Amazon Lily" is the 408th episode of the One Piece anime.

Short Summary
Having been hit by Kuma, Luffy is teleported to an unknown island. Searching for food, he comes across some unknown mushrooms, and eats them. Unfortunately, these mushrooms are "mushrooms-growing-on-body-mushrooms", and as Luffy goes to sleep, mushrooms start growing on his body. He is discovered by a trio of Kuja warriors who take him to their city in order to cure him, but during the cleaning process, it's discovered that Luffy, unlike everyone else on the island, is a man.