Dorfman, Swan and Klein introduce jewel kryptonite, the rarest form, in Action 310 (March 1964).
Parole hearings for Phantom Zone prisoners are being held in Kandor, and Superman attends. Jax-Ur, who is serving a life sentence without parole, asks to be freed, in order to help cure a plague that has struck down Lori Lemaris, and other less important residents of Atlantis.
Superman agrees, and he and Jax-Ur head to Krypton, to the Jewel Mountains. Jax-Ur relates a legend of their creation, from the skeletal remains of jewel birds. He does work on the serum for the plague, but also puts Superman to sleep, and fashions a marge wedge of jewel, having calculated (somehow) that it will travel directly to Earth.
Jax-Ur is returned to the Phantom Zone, but now he, and the others in the Zone, are able to funnel their telepathic power into the real world, through the jewel kryptonite. They make Superman think he was “exposed” to it, and that it had the result of causing combustible materials to explode when he passed near.
Superman does not fall for this, as it did not happen consistently.
Jewel kryptonite is then written off as having “no effect.” Literally, that was how it was described in the Superman pages in which i first read about it. The use it had for Phantom Zone residents was completely ignored until the 80s.
Dorfman and Mooney bring a quick resolution to the search for Supergirl’s parents in this issue.
Supergirl spends a few pages fretting, talking to Fred and Edna Danvers about her new parents, as she seeks to free them. But which set will be her “real” parents now?
Fred Danvers actually is the one to find the right frequency, which releases Zor-El and Alura.
Supergirl shows them around some of the sights of Earth, and prepares to move out, and into a new home with Zor-El and Alura. The Danvers act as if all is well, but are quietly saddened to lose Linda.
But Zor-El and Alura find the perfect solution. Not feeling comfortable on Earth, they take up residence in Kandor. Supergirl stays with the Danvers, but can visit her parents whenever she wants.