One Piece 3D2Y: Overcome Ace’s Death! Luffy’s Vow to his Friends

This new TV special tells the two years of Luffy's training with Silvers Rayleigh in Rusukaina Island after the Battle of Marineford, which has never been told in the manga or TV anime. It also features a new villain named Burndy World who is known as "The Destroyer of the World" and has the power of the MoaMoa Fruit (its ability is still unknown). Luffy has to protect Boa Hancock from the new enemy who escaped from the level 6 of Impel Down. He is newly designed by the original creator of the manga, Eiichiro Oda. (Source: Crunchyroll)

One Piece: Heart of Gold

The Straw Hat Pirates meet Olga, a girl who has escaped the island Alchemi. Alchemi was known for its metal production, and for the creation of the extremely valuable Pure Gold, but the island disappeared two hundred years ago. Olga is now being pursued by Marines, interested in Pure Gold. Gildo Tesoro, who controls the Navy HQ and black market, hears of Olga and hires treasure hunter Mad Treasure to track her down. The Straw Hats join forces with Olga in search of the Pure Gold, while she plots to takes advantage of them and use the treasure to become rich herself.

ONE PIECE: Episode of Nami - Koukaishi no Namida to Nakama no Kizuna

A retelling of the Arlong Park arc, with new animation.

One Piece: Mega Mecha Soldier of Karakuri Castle

The crew salvages a treasure chest from a sinking wreck, but inside turns out to be an old lady hiding. To get the Straw Hat Pirates to take her home, she promises them the treasure of a golden crown on her island, Mecha Island. When they arrive, their ship is first attacked by the lord of the island. But later he decides to use the pirates to help him solve the riddle of the Golden Crown. (Source: Anime News Network)