Koncurrent Krypton Kara Khronicles: Menacing Mental Mutants

Following their assistance combatting a pair of supervillains who unleashed plagues upon their parallel planets, the Girls of Steel were next tasked aboard satellites with tracking down menacing mental mutants. Each Kara was a bit headstrong, although both were courageous and led their Worlds' Greatest Heroes into outerspace to combat these old adversaries.

Despero originated from Kalanor-One before arriving on Earth-One, while Brain Wave was a natural born resident of Earth-Two. Each possessed vast powers over the mind, and were among the fiercest and most recurring of foes of the League and Society.

Both Superman and Despero were brought to the planet of Sirkus in order to amuse themselves with a battle between the two foes, along with synthetic replicas of Superman's Justice League allies. After defeating these, the real Justice League along with Supergirl will pulled to that world where they battled and defeated Despero. In this contest, despite his strong alien physique, Despero proved no match versus Kara Zor-El, the Supergirl!

Simultaneous to these events occuring, more or less, Power Girl alongside both the Justice Society and her newly formed team known as the Super Squad boarded the JSA Sky Rocket and intercepted Brain Wave's satellite headquarters. Initially, the heroes were overpowered by the barrage of Brain Wave's tremendous mental attacks as well as his ally Per Degaton's weaponry. In the end, the villains were weakened when Kara Zor-L, aka Power Girl, used her might to push Brain Wave's vessel close to the sun and outside of Earth orbit. This reversed the process of the two criminals' artificially created bodies, and restored Earth to its previously normal condition.

Just as they had done with Sonar and Queen Bee, Degaton and Brain Wave, just as had been done with a couple of mental mutants, so too each Kara would prove equal to the members of these twin teams. Soon after this, Power Girl was invited in place of her cousin Kal-L, Superman, to join the Justice Society. As for Supergirl, since her cousin Kal-El was younger and active with the Justice League, she remained a solo adventurers. Both gals would join as honorary members of the Legion of Super-Heroes and Infinity, Inc. However, the majority of Supergirl's tales were left as a member of Superman's Family, and those of Power Girl as a member of the JSA.