One Piece Film: Gold Episode 0

One Piece Film: Gold Episode 0 is a special that is a prequel to One Piece Film: Gold that released on smart phones.

Short Summary
On their way to Gran Tesoro, the Straw Hat Pirates have a barbecue and play various sports: Nami, Robin, Chopper, and Franky play volleyball, and Luffy, Usopp, and Franky have sumo wrestling matches.

Long Summary
On the Thousand Sunny, the Straw Hat Pirates are having a barbecue and the one who is enjoying it the most is Luffy. As Luffy is attempting to get more meat before it's ready, a volleyball game between Nami and Chopper versus Robin and Franky is occurring. In the conclusion of the game, the result is Nami and Chopper winning because Robin went against the rules and used her abilities. After the game, Robin gives Nami a golden coin for Gran Tesoro.

The Straw Hats then fantasize on what they'll do once they arrive on Gran Tesoro: Nami will go to the casino and use the golden coin she received from Robin, Chopper will go to the amusement park, Luffy will go to the buffet in the grand hotel, Brook will go to a dance show with young women, Zoro will drink the "world's best sake", Franky will drink cola, Sanji will spend time with women, Robin will get a massage, and Usopp will host a show in case betting in the casino fails. Usopp demonstrates his show by having a sumo wrestling match against Luffy.

Luffy is the Yokozuna and Usopp is attempting to take the title from him. During their match, Luffy is taking it seriously even though Usopp stated to him that it wasn't. Franky decides to have a match against Luffy and requests that they use their strength. In a close match that takes some time to complete, Franky and Luffy decide to use their signature attacks, Gear Third and a large beam attack from Franky. However, when Nami wakes up from her nap, she knocks out Luffy and Franky for being too reckless. Doing so, she is crowned Yokozuna, however, she denies the title. The Straw Hats then notice a beam of light in the distance, so Nami looks at her Vivre card for Gran Tesoro and it seems as if they're approaching the City of Dreams.