Turnbuckle is one of the supporting antagonists in Treasure Planet and one of the pirates in John Silver's crew. He is a grey slug-resembling alien bearing two long tenacles for each of his arms and legs. He served as the helmsman to Captain Amelia, though he may have maintained his position as such during the mutiny. He is one of the last two pirates (the other being Blinko) to die in the film; during the collapse of Treasure Planet, as he and Blinko struggled to escape with their ill-gotten gains, they were caught in the waterfall of gold coins and fell into the lava-filled crevices to their deaths.