When Superman’s home planet Krypton exploded, a big chunk containing Argo City and its inhabitants remained intact and drifted through space. Eventually that chunk of the planet turned into Kryptonite, deadly to the last of Krypton’s survivors. The life of teenaged Supergirl was spared by her father, who built a rocket and sent her to earth. After seeing her rocket land, Superman investigated and discovered the super powered teen. … Read More