ONE PIECE Episode 38: Luffy in Big Trouble! Fishmen vs. the Luffy Pirates!
Episode 38 of 1180 of ONE PIECE, aired August 23, 2000, 25 minutes. Available with English subtitles and dub where released.
Episode summary
The Straw Hats' faith in Nami is restored, and now it's time for a battle royal! Luffy and the gang are determined to make Arlong pay for mistreating their friend.