Doralla Kon, a scientist originating from another dimensional plane of existence, arrived on Earth-One from her native Alkomar with the power of superspeed. She quickly meets the Flash whom she befriends. However, they determined that her presence on Earth caused matter to explode, so she returned home. Some months later, Doralla returned to Earth-One to track down a criminal from her world named Korakar, who sought to impersonate the Flash in a bid to conquer his homeworld by stealing his fellow residents' speed. In order to control this speed force, he then intended to absorb the Flash's speed as well in order to control his extra powers. Doralla and the Flash defeated Korakar and his gang, and she returned with him to Alkomar following this tale.
Doctor Maria Flura was a resident of Earth-Two who made the acquaintance of fellow scientist Jay Garrick, when both were recruited to ascertain the whereabouts of a missing reporter. When they located him in a Secret City, secluded from civilization with duplication technology to protect themselves from the outer world, Maria and Garrick came in conflict with the city's leader. When Jay as the Flash defeated him, this nevertheless spurred on a desire for Maria and a Professor Lexon to recreate their technology. Prior to this, however, Maria as well as the Flash were thought to be threats of the golden age Star Sapphire, who shunted them both into her 7th dimensional world, although the pair found their way back to Earth-Two and defeated Sapphire. Later, Maria discovered that Professor Lexon had used their replication device for his own selfish means, and aided the Flash in defeating him and his virtual henchmen.