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Superman is split by a cobalt bomb’s explosion into two duplicate Supermen, differentiated only by the fact that one lacks a vision power the other has: Superman-T, as he calls himself, has telescopic vision, while Superman-X has X-ray vision. The two Supermen work together for a time, until Superman-T heroically sacrifices his life to knock aside a giant Kryptonite meteor heading towards Metropolis. Upon Superman-T’s death, Superman-X regains all his former powers.