Fans are about to witness a major turn of events in "One Piece" Episode 863 titled "Break Through! The Straw Hats' Mighty Sea Battle!" Aside from Big Mom's transformation, viewers will also see Luffy and Katakuri's battle and the continuation of Carrot's attack on Daifuku's Fleet.

Carrot will do her best to bring Daifuku's Fleet down on "One Piece" Episode 863. However, she will eventually get tired of the battle because she is not used to be in the Sulong form for a long while. But she will manage to defeat the enemy. Here, Brook will come to the scene.

Brook will carry Carrot on her back where she will take a rest. While she closes her eyes, her Sulong transformation will be gone. Daifuku's Fleet will move, and Sunny will go forward in "One Piece" Episode 863.

Aside from Carrot, fans will also witness Big Mom's transformation. In "One Piece" Episode 863's teaser, Big Mom will be skinnier, but fiercer. As Carrot is about to lose her Sulong transformation, the other Straw Hat members will do their best to keep Big Mom away as long as they can.

However, it looks like their move will fail as there will be an evolution of the powerful Yonko in "One Piece" Episode 863, per Comic Book. Big Mom also seems very hungry at the time.

From the looks of it, the hunger eats away her body that makes her skinnier than she used to be. There will also be a quick flashback to Big Mom's younger self that will show the same physical look in "One Piece" Episode 863. But her transformation is reportedly "frightening."

Big Mom's hair will be in aflame in "One Piece" Episode 863. It also looks like she makes her way to the Thousand Sunny. Although they successfully keep her at bay, they will get trapped and left with no choice but to fight her.

Big Mom's transformation in "One Piece" Episode 863 will be one of the most powerful transformation fans will witness in the Whole Cake Island arc. However, there will be another significant transformation that fans need to see as the arc continues.

Fans will also witness Luffy and Katakuri's battle once again in "One Piece" Episode 863. However, their fight may be very brief. Otakukart anticipates that viewers will see Luffy trying to foresee the future. As this scene gets briefly featured in the manga, the publication assumes the anime series will make it better.  

"One Piece Episode 863 will air on November 25, 2018. Fans can watch it either on Crunchyroll or Funimation.