Thriller Bark arc

The Thriller Bark arc is the eighteenth story arc in the manga and anime series One Piece.

Arriving in the Devil's Sea
Three days after the Post-Enies Lobby arc, the Straw Hats enjoy the features of their new ship; Usopp and Luffy go fishing together and toss everything they catch into the aquarium; Robin, Franky and Sanji relax in the dining room, Nami takes a bath in the bath hut, Chopper enjoys his expanded room/infirmary and Zoro takes a nap in the observation tower.

When Zoro wakes up, he notices a barrel floating in the ocean and alerts the rest of the crew over the built-in speaker system. When they fish the barrel out of the sea, they notice that it is an Offering to the Sea God. After a short discussion, they open the barrel, but instead of finding food and sake, a Red Light shoots out of the barrel and into the sky. Fearing that someone may spot them and knowing that a big storm is heading in their direction, Nami orders the crew to head southwest. Unfortunately, the Highwind catches them, prompting Franky to unveil the Dry Soldier Deck System Number 0; a set of paddle wheels. Using the paddle wheels they avoid the storm and finally enter the Florian Triangle.

At first Usopp thinks they might already have arrived at Fishman Island but he is quickly corrected by the others who explain to him that they are in fact in the Florian Triangle (he did not know this, since he was not around when Kokoro told the others about it). Upset that he was not notified about this and scared about the ghosts, he quickly grabs his exorcism set to rebuke any evil Spirits. Suddenly, he and the rest of the crew hear a "Yohohohoho" song and discover a Ghost Ship that has suddenly appeared behind them.

Brook
Intrigued, Luffy starts to board the ship, with Nami and Sanji behind him, who want to stop him "in case he does something impulsive and stupid". When they arrive on board of the ship they are greeted by the self-proclaimed "Gentleman Skeleton" Brook, whose first action is to question Nami whether or not he may see her panties. She, of course, denies this and hits Brook. Luffy, finding all this hilarious, asks Brook if can "take dumps", to which Brook replies with a yes. Sanji then starts to shout questions at Brook only to be interrupted by Luffy, who, much to the shock of everybody else, asks Brook to join his crew. Brook replies by saying: "sounds good".

Brook goes with them back to the ship and ends up having dinner with the crew. Brook is explaining his Devil Fruit ability when Usopp (in full exorcist gear) notices that he has no shadow and no reflection. Brooke explains how his shadow was stolen, and sadly cannot leave the foggy Florian Triangle with the Straw Hats. Not wanting his new friends to get hurt, Brook refuses to reveal the culprit. Nonetheless, meeting the crew has brightened his dreary existence, and Brook is about to play the violin when a ghost appears. Just then, the gates of Thriller Bark capture the Thousand Sunny. Brook warns the Straw Hats to escape and runs across the water to Thriller bark.