Electro
Electro
An electric "being" that comes to Earth from a fictional "Dimension X" to request the help of Superman. The creature is actually a creation of Lex Luthor, intended to lure Superman into a space ship, as part of a trap that would detonate a bomb under Metropolis should the Man of Steel attempt to ever leave it. Luthor's plans to blackmail the leaders of the world into handing over their nuclear arsenals is foiled when Superman manages to escape the exile (Act No. 271/1, Dec 1960: "The Voyage to Dimension X!").
Some time later, the Superman Revenge Squad uses Red Kryptonite to induce horrble nightmares in Superman's mind. One of these nightmares includes the Man of Tomorrow facing a jury of villains, one of which is called "Electro" and exactly resembles the electric being from the previous adventure (Act No. 286/1, Mar 1962: "The Jury of Super-Enemies!"). The complex scheme to use illusions is thwarted as Superman is finally able to notice differences in the nightmare scenarios (Act No. 287/1, Apr 1962: "Perry White's Manhunt for Superman!").