Adventure Comics #255

In "The Splitting of Superboy," a Martian ray infused with Red Kryptonite fractures Superboy into two distinct beings: the heroic Superboy and a separate, darker Clark Kent. As the two struggle to coexist, the Clark persona turns violently against his other half, seeking to eliminate him and claim all of Superboy's powers for himself—leading to a climactic clash fought not with fists, but with robotic surrogates.

In "Aquaman's Double Trouble!", the ocean's protector faces one impossible choice after another—saving a sinking ship or protecting a coral reef, defending a submarine or preserving marine life—only to discover that every time he chooses, the other side is mysteriously spared. A shadowy old seafarer appears at each scene, leaving behind three strange holes, and when Aquaman is finally in peril, the truth emerges: the guardian is none other than King Neptune himself, the legendary former ruler of the seas, now revealed with his three-pointed trident.