Thrilling Wonder Stories published Leigh Brackett’s Sea Kings of Mars in the June 1949 issue. In 1953, ACE BOOKS published Sea Kings of Mars under the title of The Sword of Rhiannon (as half of an ACE DOUBLE with Robert E. Howard’s Conan the Conqueror on the flip side). PLANET STORIES should be praised for bringing back Leigh Brackett’s classic novels, especially this wild adventure of time travel, epic warfare, and alien super-science. There’s a cruel, beautiful princess, a crafty archeologist, and the evil reptilian Dhuvians in Leigh Brackett’s breathtaking story. They just don’t write books like this any more, sadly.