Prostetnic Vogon Jeltz is an alien who appeared in The Hitchhiker's Guide to the Galaxy. As described in the presskit for the film, "Jeltz is the commander of the Vogon Constructor Fleet and is not a pleasant sight, even for other Vogons. His dark green rubbery skin is thick enough for him to play the game of Vogon Civil Service politics, and play it well, and waterproof enough for him to survive indefinitely at sea depths of up to a thousand feet with no ill effects."