Superman; Clark Kent; the Galactons [Nula [Supergirl]; Elura; Alena]; Perry White; Lois Lane; Phantom Zone inhabitants [Vax-Nor (introduction, released); Kur-Dul (introduction, released); Gor-Nu (introduction, villain); Jax-Ur; Kru-El]
Synopsis
In order to keep Superman safely out of Kandor, Supergirl and two Kandorian women pose as the Galactons. The Phantom Zone criminal Gor-Nu is released long enough to help save Kandor.