Hyathis was defeated and captured by the combined power of Wonder Woman and Aquaman. Eventually, the entire Justice League was able to trick and defeat Kanjar Ro, and all four rulers were marooned on a small planet with a barrier created by Green Lantern's ring around it. After the four of them were able to use willpower to make a crack in the barrier, Kanjar Ro escaped, leaving the others behind. Later Hyathis' loyal Alstairan followers rescued her from the prison world, and took her to the planet Thanagar. Hyathis adapted Alstairan medicine to provide a workable cure for a deadly plague sweeping the planet. She required that the Thanagarians appoint her "Empress of Thanagar" before she would give them the cure. Hyathis transformed the Thanagarian people into a warlike race. This led the Thanagarian Empire to attempt conquest of the planet Rann. Hawkman was able put an end to the conflict. With the help of Superman and Batman, Hawkman was also successful in deposing Hyathis. Aggressive Thanagarian factions later freed Hyathis, and then launched a shadow war against Earth. Hawkman and Hawkgirl were successful in halting these factions, but Hyathis escaped.