During the "Hypertension" story arc of the Superboy series, a Superboy from another Hypertime reality was grown to full age to become Superman, but later became Black Zero in the midst of anti-clone sentiment.
Hero eventually lost his vest, but found the even more interesting "H-Dial" (of Dial H for Hero fame), and soon realized that by spelling H-E-R-O on its dial, he would be granted the powers of and persona of one of several superheroes, supposedly merging with them using hypertime.