There has been a longheld believe that the pre-Crisis Earth-Three had only six costumed crusaders and/or criminals.. the five Crime Syndiate members known as Ultraman, Superwoman, Owlman, Johnny Quick and Power Rig as well as their arch-foe Alex Luthor. And that would be correct. However, there were other metahumans who menaced that world's populance, albeit only briefly. During his brief freedom from their limbo dimension prison, the Syndicator Power Ring's power battery infected various humans with a radiation plague granting them incredible power. Only the timely intervention and treatment administered by Earth-One's Captain Comet saved this planet from further chaos at the hands of malevolent malcontents!
Oh, and that woman in the first panel is Earth-Three's Lois Lane, who would quickly become smitten with her globe's first record superhero, the Captain himself. It would be his inspiration that would lead to the first native-born champion of justice to appear there, Alex Luthor, in a few years.