Superman Red is an alternate version of Superman created when the hero used a mind enhancing machine powered by Kryptonite to increase his intelligence. The radiation caused Superman to split into two super-intelligent beings; the Superman Blue and Superman Red. Eventually, they saved the world together and married Lana Lang and Lois Lane respectively.
In the New Earth, Superman used a Red and Blue containment suit when he experienced a weird power fluctuation that rendered him in the form of pure energy. He found that he was considerably faster, intangible, and able to interact with computers in this energy form, and lost his vulnerability to Kryptonite.
Superman Red was created by Leo Dorfman and Curt Swan, first appearing in Superman #162 (1963).
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