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Grewnge is one of John Silver's gang of intergalactic pirates recruited to serve aboard the spaceship RLS Legacy in her expedition to find the legendary treasure of Captain Flint. He is a portly humanoid reptilian with a flat face and two pairs of short horns or antennae, and operates the laser cannons on the ship. He participated in the mutiny along with the other pirates which successfully took control of the vessel and found the treasure chamber, but was later arrested along with Hedley, Torrance, Onus and Krailoni; and presumably brought to trial.