Captain Nathaniel Flint is a posthumous villain in Disney's 2002 animated feature film Treasure Planet. He was a space pirate renowned by those who knew him as one of the most notorious such criminals in galactic history.
Captain Nathaniel Flint belonged to an unnamed alien species with fangs, multiple eyes and a skull-like face. At some point in his life, he became a pirate, and his infamy was so staggering that he was known as the most feared of all pirates. At some point, he apparently stole Treasure Planet from a highly-developed species of unknown identity. After many years of looting merchant ships, Flint buried a vast treasure in the center chamber of treasure planet (which is in fact a giant alien mechanism). He entrusted the map to Treasure Planet to his first mate Billy Bones and stole the memory chip of his robot navigator, B.E.N.. Flint also rigged the planet to explode if someone should find his treasure. Shortly after setting up this deadly booby trap, Flint stayed inside the center of Treasure Planet with his treasure and soon died guarding it.
When the R.L.S. Legacy crew discover the treasure in the present day, Jim and B.E.N. encounter Flint's long dead skeleton, and Jim tears off one skeletal hand to find and insert B.E.N's memory chip, and they proceed to set off the booby trap.
In the original Treasure Island novel, Captain Flint's name is Captain J. Flint (it is unknown what the J stands for). In contrast to the one in the movie, the novel version of Flint actually wanted someone to find his treasure, having used a corpse to point the way to it. In the movie, the skeleton the crew finds is Flint's own.
He is the posthumous overarching antagonist of the movie.
Jim finally meets Captain Flint
B.E.N.'s memory circuit in the bony clutches of Flint