Cover pencils by Curt Swan, inks by George Klein. "Superman Versus Super Clark Kent!", script by Otto Binder, art by Al Plastino; An atomic explosion seems to split Superman and Clark Kent into separate people, but it's a plot by Professor Vakox to trap Superman in the Phantom Zone. Challengers of the Unknown ad. Brief Batman appearance in Supergirl reprint, "The Four Helpless Heroes!", script by Jerry Siegel, art by Jim Mooney; With Superman on a space mission, Supergirl has a day full of emergencies to deal with, but there's a big surprise at the end of it.
*Grading Notes: Book length crease in center of back cover.
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