Spoilers for "One Piece" chapter 839 suggest that Brook will have the power to control one of Big Mom's soldiers.

Fans speculate that in the next chapter, the Soul King will come up with a plan that will allow him to use the Devil Fruit as a weapon. As for Carrot and Chopper, some speculate that they will discover something shocking in the Mirror World.

According to spoilers, the two will find out that all the mirrors in the entire Whole Cake Island are actually interconnected. Nami and Pound will reportedly take advantage of this discovery as they battle against Brulee in chapter 839. Another spoiler suggests that Nami will play a crucial role in a big fight that will ensue next chapter.

Theories about an upcoming wedding have also been swirling around. Some speculate that Shanks is the character who will get married in the next chapter, since in the cover of chapter 838, he was shown wearing pants and holding a bunch of roses. On the other hand, some speculate that the wedding could be of Sanji and Pudding, and Shank is just there to gatecrash.

Fans of the manga series also speculate that chapter 839 will see the Sun Pirates take their revenge against Big Mom's crew.

Prior to the release of "One Piece" chapter 838, fans predicted that Luffy will finally get to defeat Big Mom. It turned out, however, that their fight was not going to end just yet as another warrior emerged out of the armor and slashed his arm. As the chapter progressed, Luffy found out that Big Mom actually devoured a Biscuit Devil Fruit to give him extra power.

"One Piece" chapter 839 is expected to be released in one week.