A 30th century native of Titan, the largest moon of the planet Saturn, Imra Ardeen travels to Earth and co-founded the Legion of Super-Heroes with Cosmic Boy and Lightning Lad. Imra also became leader of the Legion after solving Proty's riddle in "The Eight Impossible Missions". She offers to sacrifice her life to resurrect Lightning Lad but Proty, Chameleon Boy's shape shifting pet, assumes her identity and perished in her stead.
Saturn Girl possesses, like all the inhabitants of Saturn and its satellites, the ability to perform â€œamazing mental feats,â€ including â€œsuper hypnotismâ€ (S No. 147/3, Aug 1961: â€œThe Legion of Super-Villains!â€; and others),extrasensory perception (S No. 165, Nov 1963: â€œBeauty and the Super-Beast!â€; â€œCirceâ€™s Super-Slaveâ€; and others) and telepathic communication (S No. 156, Oct 1966: â€œThe Last Days of Superman"; â€œSupermanâ€™s Death Sentence!â€; â€œThe Super Comrades of All Time!â€; â€œSupermanâ€™s Last Day of Life!â€; and others). Saturn Girl also possesses the power to confer â€œtemporary telepathic powersâ€ on other creatures (S No. 176/1, Apr 1965: â€œThe Revenge of the Super-Pets!â€).
The adult Saturn Girl is called Saturn Woman. As an adult, Imra wed long time beau Garth Ranzz (Lightning Lad).
In August 1961, Saturn Woman and two other adult Legionnaires, Cosmic Man and Lightning Man, join forces with Superman in his battle with Lex Luthor and the Legion of Super-Villains (S No. 147/3, Aug 1961: â€œThe Legion of Super-Villains!â€).
In April 1962, Saturn Girl is among the six Legionnaires who play an elaborate hoax on Super man and Supergirl as a prelude to celebrating the anniversary of Supergirlâ€™s arrival on Earth (S No. 152/1: â€œThe Robot Master!â€).
In October 1962, when Superman is believed to be dying of exposure to Virus X, an incurable Kryptonian malady, Saturn Girl is among the Legionnaires who are summoned to the 20th century by Supergirl to help carry out the gigantic super-tasks that Superman hopes to fulfill as his final legacy to humanity, including the destruction of a â€œvast cloud of fungus in distant space, that will some day reach Earth and blight all plant life,â€ and the melting of the Antarctic ice, â€œto make Antarctica a fit place for millions to live in the future,â€ thus ensuring â€œa home for Earthâ€™s expanding population-..!â€ Later, it is Saturn Girl who receives an urgent telepathic communication from Mon-El, inside the Phantom Zone, informing her that Superman is not suffering from exposure to Virus X at all, but rather from the debilitating effects of a nugget of Kryptonite that has become accidentally lodged inside Jimmy Olsen's camera. Indeed, once the kryptonite nugget has been removed. Superman is restored almost immediately to perfect health (S No. 156: â€œThe Last Days of Superman!â€ pts. I-IIIâ€”â€Supermanâ€™s Death Sentence!â€; â€œThe Super-Comrades of All Time!â€; â€œSupermanâ€™s Last Day of Life!â€).
In November 1963, with the aid of Proty II, Saturn Woman poses as the enchantress Circe as part of Supermanâ€™s plan to defeat the Superman Revenge Squad (S No. 165/1: pts. I-IIâ€”â€Beauty and the Super-Beast!â€; â€œCirceâ€™s Super-Slaveâ€).
When Metropolis television station WMET-TV inaugurates its new â€œOur American Heroesâ€ series with a program honoring Superman, â€œour greatest American hero,â€ Saturn Girl is among the Legion representatives who journey to the twentieth century to appear on the show and thus help pay tribute to the Man of Steel (Act No. 309, Feb 1964: â€œThe Superman Super-Spectacular!â€).
In October 1964, after Superman has been deprived of his super-powers by the baleful radiations of a mysterious green comet, Saturn Girl and two of her fellow Legionnairesâ€” Cosmic Boy and the Invisible Kid â€”use a â€œtime-force wave carrierâ€ in their 30th century clubhouse to endow Superman temporarily with their various powers so that he can use them in his upcoming battle with Lex Luthor and Brainiac, For a period of â€œa few hours,â€ therefore, until his borrowed powers fade and vanish, Superman is equipped with Saturn Girlâ€™s â€œpower of telepathic thought-casting,â€ Cosmic Boyâ€™s â€œpower of super-magnetism,â€ and the Invisible Kidâ€™s â€œpower of invisibilityâ€ (S No. 172: pts. I-IIIâ€”â€The New Super man!â€; â€œClark Kentâ€”Former Superman!â€; â€œThe Struggle of the Two Supermen!â€).
In April 1965, Saturn Girl imparts temporary telepathic powers to Beppo the Super-Monkey, Krypto the Superdog, and Streaky the Supercat, to enable them to communicate telepathically with Superman during a joint adventure in the year 1866 (S No. 176/1: â€œThe Revenge of the Super-Pets!â€). (see Cyrus Atwill)