Jack, also known as 'Jack the Drought,' is one of the three All-Stars of the Beasts Pirates in the anime and manga series One Piece. He serves under Kaido, one of the Four Emperors, and is notorious for his destructive power and ruthless nature. Jack is a giant fish-man who possesses an Ancient Zoan-type Devil Fruit, the Zou Zou no Mi, Model: Mammoth, allowing him to transform into a mammoth. He is a formidable antagonist, playing a major role in the 'Zou' and 'Wano' arcs.