ONE PIECE Episode 171: The Roaring Burn Bazooka! Luffy vs. War Demon Wyper!
Episode 171 of 1180 of ONE PIECE, aired October 26, 2003, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Luffy fights Wyper, but after some time, he falls into some underground ruins. Meanwhile, Eneru appears on the Going Merry and after telling that his true goal was the City of Gold, he takes out both Usopp and Sanji; then he vanishes and leaves Satori's brothers: Hotori and Kotori to avenge him.