From the edge of the Milky Way, a winged creature named Rokan speeds toward Earth. Superman confronts the beast and realizes it is Rokan, a beast from Krypton which was thought to be extinct, and since Rokan is from Krypton, she has the same powers as Superman. Escaping, the creature wreaks havoc on Earth. The Super Friends attempt to stop Rokan by chasing her and her babies away with kryptonite.