Initially she believed herself to be Superman 's cousin , as she had been before the reboot .
The 1985 Crisis on Infinite Earths limited series erased the existence of the Earth - Two Superman , and Power Girl 's continuity was thus substantially disrupted .
Initially Power Girl believed herself to be Earth - Two Superman 's cousin , as Power Girl had been before the reboot .
The 1985 Crisis on Infinite Earths limited series erased the existence of the Earth - Two Superman , and Power Girl 's continuity was thus substantially disrupted .