Action Comics 341 (Sep 1966) FI/VF (7.0)

Superman Versus Super Clark Kent!

Script: Otto Binder

Pencils: Al Plastino

Inks: Al Plastino

Characters: Superman [also appears as Clark Kent]; Perry White; Lois Lane; Baron X; Professor Vakox (Phantom Zone villain, escaped and posing as Clark Kent); Phantom Zone inhabitants [Jax-Ur; Dr. Xadu]

Synopsis: 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.