Is ONE PIECE episode 576 filler?
Filler Yes, episode 576 of ONE PIECE is filler.
#576
Z's Ambition! A Dark and Powerful Army!
Ｚの野望編 謎の最強軍団登場！
Aired 9 Dec 2012
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.