![cover image of The Great Dome on Mercury](https://img1.od-cdn.com/ImageType-400/2316-1/DEB/165/08/{DEB16508-2588-4594-A84C-8C4D97A48CEC}Img400.jpg)
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Trapped in the great dome, Darl valiantly defends Earth's outpost against the bird-man of Mars and his horde of pigmy henchmen.