Watch anime online, stream anime episodes for free, you are watching One Piece – Episode 172 English version online and free episodes. Anime Episode guide, Chapter One Piece – Episode 172 English Subbed The Ordeal of Swamp! Chopper vs Priest Gedatsu! Chopper is attacked by Gedatsu, who turns out to be a complete moron, and eventually defeats him, sending him plummeting to the Blue Sea. Conis and Pagaya help Aisa, and head to Upper Yard.