ONE PIECE Episode 43: End of the Fishman Empire! Nami`s My Friend!
Episode 43 of 1180 of ONE PIECE, aired September 27, 2000, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Something about Nami's former prison gives Luffy an added burst of strength. He's so moved by her terrible past that he vows to destroy all of Arlong Park!