First Silver Age appearance of Two-Face.
The Jekyll-Hyde Heroes (Superman, Batman and Robin / written by Jim Shooter) The evil Dr. Aaron uses his "Psyche-Distortor" chemicals to turn the heroes into people they fear the most : Batman into Two-Face and Superman into Kralik! The two new villains rampage Metropolis. Can Robin save the day? Or will someone else defeat the mad scientist? The Super-Key to Fort Superman (Editors' Round Table choice / written by Jerry Coleman : reprinted from: Action Comics #241)