Superman [Clark Kent]; Lois Lane; Jimmy Olsen; Queen Lura; Prince Yikar; Lana Lang; Professor Lang
Synopsis
A hot air balloon accident in the mountains strands Clark, Lois, and Jimmy in the hidden city of Mystri-Lor, where the queen decides she wants Clark as a husband.
Supergirl [Linda Danvers]; Lex Luthor; Legion of Super-Heroes [Cosmic Boy (cameo); Saturn Girl (cameo); Lightning Lad (cameo)]; Superman [Clark Kent]; Superman Robots; Lori Lemaris (cameo); Lena Thorul; Phantom Zone inhabitants [Kru-El; General Zod; Jax-Ur]
Synopsis
Luthor teams up with the escaped Phantom Zone villains, who give him super-powers, but they eventually turn on him and try to expose him, Supergirl, and Superman to Gold Kryptonite. In the end, Luthor helps to defeat the villains and then surrenders so that Superman can save his sister Lena from being trapped in Kandor.