Superman is ready to announce Supergirl's existence to the world, but she mysteriously loses her powers at the last minute.; Kandorian scientist Lesla-Lar changes places with a de-powered Supergirl using her teleporter ray and begins her plan to destroy Superman.; Superman reveals Supergirl to the world.; Supergirl stops a creature from another dimension in her first solo adventure after Superman revealed her to the world.; Now that Supergurl has lost her super-powers, Linda can be adopted by the Danverses. Kandorian scientist Lesla-Lar uses her tranporter ray to change places with Supergirl and becomes Lex Luthor's secret weapon.; A Red Kryptonite meteor turns Supergirl into a mermaid. She visits Atlantis, where Jerro proposes to her, but neither of them realizes that Lori's sister Lenora is also in love with Jerro.