The Atom was a scientist who attempted to extract a new kind of energy from microscopic superstrings but caused a singularity that threatened to grow and replace the universe. He was transformed into a being capable of atomizing his entire physique, and so he was best suited to contain the singularity. However, he realized that the singularity was alive and inhabited, a complete microscopic continuum trying to expand into his universe at the speed of light. The Atom was unable to save his universe, leaving him as the sole survivor.
Upon arriving in the new universe, he encountered its first resident, Superman Prime, who shared his sympathies with the Atom for losing everything he had known and welcoming him to stay in this new reality. The Atom soon found his place in the Justice Legion A.
