Watch 'One Piece' on Crunchyroll\n\n Crunchyroll offers numerous apps that allow you to stream One Piece on your tablet, smartphone, smart TV, or gaming consoles. If you don't mind sitting through commercials, you can watch One Piece on Crunchyroll for free.

No, It's Essential One Piece - IMDb. Filler arcs are common in shonen anime. When the anime runs out of source material to adapt, the studio will create its own story to fill time until the manga reaches a point that the adaptation can continue. One Piece is a rare exception where there isn't that much filler.