The story arcs aboard the Straw Hat Crew's first ship Going Merry (Merry Go in some adaptations) are recreated with brand-new animation, from Luffy and Usopp's fight and Robin's disappearance to the crew's final farewell to the ship. Going Merry is treated as another member of the Straw Hats as Luffy, Zoro, Nami, and the rest of the crew set sail for the legendary treasure, the One Piece. (Source: ANN)

The special will revisit the childhood past of the three sworn brothers Luffy, Ace, and Sabo, when they all dreamed of becoming pirates. In addition, it will depict how Sabo originally came into the kingdom of Dressrosa (which was not depicted in Eiichiro Oda's original manga or the television anime), as well as his reunion with Luffy from his point of view.

It was a successful science experiment gone horribly wrong. When a team of scientists discovers the DNA of the ancient Pokémon Mew, they harnessed the potential within it in an attempt to create the ultimate living weapon. With advanced cloning techniques and resources provided to them by Team Rocket crime syndicate leader Giovanni, the scientists succeed in creating the powerful psychic Pokémon, Mewtwo.

Pokemon: Mewtwo no Gyakushuu reveals the terrifying power of Mewtwo as he learns that not only was he created to be an experiment, but also to be a tool for Giovanni’s sinister dealings. Breaking free of his control, Mewtwo creates his own island fortress and reconstructs the cloning technology that gave life to him.

Under the guise of being a master Pokémon trainer, Mewtwo lures the best trainers in the world to his base. Among these trainers are Ash Ketchum, his loyal Pokémon Pikachu, and their friends Brock and Misty. United together, human and Pokémon alike, they must not only discover the hidden secret of Mewtwo's plans, but stand against his terrifying might. If they fail, Mewtwo’s vengeance will not only lead to tyranny over all the Pokemon, but also the extinction of the human race.

Mii Snowdon is left on her own after her father disappears while investigating the mysterious letter-shaped pokemon called the Unown. The only clue to her father's disappearance is a box containing several tiles. While playing with these tiles, Mii makes a wish to see her father again, and this wish awakens the Unown—who summon the lion-like, legendary pokemon Entei to act as her father.

Meanwhile, Satoshi heads to Greenfield with his faithful pokemon companion, Pikachu, to meet with his friends, Kasumi and Takeshi. When they reach the area, they are shocked to find the place crystallized. They quickly learn that the Unown are responsible for this, and that they will need to be defeated in order to restore Greenfield to its former beauty.

The situation becomes personal when Satoshi's mother is kidnapped by Entei. To discover why his mother was taken away, Satoshi, along with his friends and pokemon, must travel the crystallized landscape to confront Entei and the Unown. 

[Written by MAL Rewrite]