Power Girl

Power Girl battled Cyborg Superman during the "Sinestro Corps War" story line.

While her origins have been confusing in the past, it is now known that Power Girl is in fact the cousin of the Superman of Earth-2, somehow having survived the "Crisis on Infinite Earths." Power Girl helped Superman trap Maaldor in his own evil dimension.

Hayden became infatuated with Power Girl, as a relic of the universe only his fractured mind remembers. Roger Hayden became the second Psycho Pirate when he found the fabled Medusa Mask, an artifact with the ability to control men's minds. As a Kryptonian of the Earth-2 universe, Power Girl has all the powers of Pre-Crisis Superman. She has super strength, speed, flight and invulnerability. She also has super sense and heat vision. When Supergirl of Earth-One arrived, the two's power seemed to go haywire when they touched each other. They battled briefly and appear to be evenly matched. Power Girl also has the same weakness as Superman except her's is aa "occasional weakness" to Kryptonite. The reason it is occasional weakness is because she is from Earth-Two. It was revealed in Infinite Crisis that she and other Earth-Two Kryptonians could only be affected by Kryptonite from Earth-Two and not Earth-One.

While her origins have been confusing in the past, it is now known that Power Girl is in fact the cousin of the Superman of Earth-2, somehow having survived the "Crisis on Infinite Earths."