Istvatha V'han
About
She is known as the "Empress of a Billion Dimensions," a beautiful dimension and time-travelling villainess who's tried to conquer Earth's dimension on several occasions. She currently has conquered the Gadroon and uses them as her launching point in this dimension.
Background
The resources of her realm, of which she is the unquestioned ruler, are immeasurably vast, but due to the quirky and unpredictable nature of interdimensional travel she cannot employ her troops and materiel en masse to simply conquer one dimension after another (neither can Tyrannon; they both have to be somewhat more subtle and slower-paced than that). Still, through her command of dimensional technology she can bring enough of a force through to create serious problems in any dimension. Those who do not simply bow to her will and accept the benefits of her rulership are usually conquered within the space of a year or so (to use Earth terms).
Despite her sometimes tyrannical and highhanded nature, the Empress is generally a good ruler, and is reasonably well-liked by her people. Her bureaucracy is efficient and usually quite loyal, for the horrible punishments she visits upon those who betray her or succumb to corruption are common knowledge. Most of the dimensions she rules are better off now than they were before... all they had to sacrifice for it was their freedom.
And now, at long last, Istvatha V'han has set her sights on a conquest she has long avoided the home dimension of Earth. She has known of Earth's dimension for dozens of years, but skirted around it because of the high percentage of superhumans in its population. In 1998, by Earth's calendar, she finally felt powerful and confident enough to accept the challenge. Her expectations proved incorrect, as the superhumans of Earth banded together to fend off her assault. The Champions thwarted another attack in early 2002. She is undoubtedly already beginning preparations for a third attack, one of such magnitude and overwhelming power no one can hope to resist it.
- Article from http://championsonline.wikia.com/wiki/Istvatha_V%27han