Superman in "Superman Versus Super Clark Kent!"
Written by Otto Binder, penciled & inked by Al Plastino.
*When Superman tries to corral robots which have stolen multiple hydrogen bombs, something goes wrong and there is a massive explosion. Once the dust has settled, Superman is surprised to find that he has been split into two individuals, Superman and Clark Kent.
Supergirl in "The Four Helpless Heroes!"
Written by Jerry Siegel, penciled & inked by Jim Mooney.
Reprinted from Action Comics (1938) #270.
Cover art by Curt Swan.