Power Girl appears in 1143 issues.
Kara Zor-L is a Kryptonian, she's from the Krypton of the Earth 2 reality. In The New 52, she was her world's Supergirl. She traveled to Earth 1 with her friend and partner, Helena Wayne (Huntress) and took the name Karen Starr. She owns a high-technology corporation, Starr Enterprises, which she uses to hunt for a way home for her and Helena. Pre-New 52, she was a member of the Justice Society and the Justice League. She was a survivor from DC's "Earth-Two" after the Crisis on Infinite Earths.