Jelly was a crewmember serving aboard the Flying Dutchman under the command of Davy Jones.
Spending so much time onboard the Dutchman transformed Jelly´s body; he had multiple jellyfish clinging to his body, most notably a large specimen covering his left eye. This eye was black and lifeless, giving the impression of a hyphema. The human elements that could still be glimpsed underneath the jellyfish membrane appeared to be regressing back to an embryonic state. His skin became corrosive and translucent, and seemed similar to symptos of Ebola, where the skin began to rash and liquify.