MV Comix #18/1972

In a shocking twist, Superman and Supergirl clash in a brutal, escalating fight at the Fortress of Solitude, their powers tearing through the icy halls as they seem determined to destroy one another. Just as violence reaches its peak, Superman pauses—suddenly realizing the truth behind their fury, though the reason remains shrouded in mystery.

In the year 2965, Klar Ken T5477, the latest in a line of Supermen whose legacy stretches back a thousand years, is called to action when a notorious criminal known as Muto is spotted robbing a Neptunian bank. Though his family has long been immune to kryptonite, Klar still bears the physical burden of a past atomic war—its lingering residue in the oceans paralyzing all Kryptonian descendants. Deputized by the Federation of Planets, he must now balance his role as a lawman with the hidden weakness that could undo him.