Longbourne is one of the supporting antagonists in Treasure Planet and one of the pirates in John Silver's crew.
He is voiced by Denis Leary.
His alien appearance resembles a purple eel, only added with arms, 2 pairs of legs, and his eyes peer from inside his mouth, due to his eye stalks being attached to his tongue. This feature is comically used as an excuse such as when he sticks his tougue out at Arrow when he is scolded for encouraging a brawl between Jim and Scroop. He is one of the first three pirates, the other two being Fayvoon and Hands to die in the film, when a misfire from Doppler resulted in falling debris, destroying the floorboards and sending the pursuing pirates falling out of the ship's longboat room from a great height to their apparent deaths.