Action Comics (1938-) #311

“SUPERMAN, KING OF THE EARTH!” Red Kryptonite splits Superman and Clark Kent into two separate beings: a tyrannical Superman who forces the United Nations to declare him king of the world, and a non-super Clark Kent who leads an underground movement against him. Plus, “THE DAY SUPER-HORSE BECAME HUMAN!” On Valentines' Day, Comet the horse watches as Supergirl is showered with affection, and he wishes that he could also express his feelings for her.