After the Justice Society disbands, Power Girl would join the Justice League. Later, while a member of Justice League Europe, she suffers a near fatal injury while battling a mystical being. Superman must assist in her medical treatment, using his heat-vision to perform surgery on her otherwise-invulnerable tissues. Although she recovers, Power Girl is significantly weaker, as she lost her vision powers and could not fly for a time. However, she regained them all as time went on. Power Girl adopts a one-eyed mangy cat, an animal which would affect much of the team. One aspect of this is her beloved cat is used to spy on the group by intelligence gathering criminals.