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Jaxon Rugarth was a professor at Metropolis University's Time Institute in the latter part of the 30th Century. He volunteered to test an extremely powerful time machine developed by Rond Vidar, a leading theorist and the son of Universo as well as being an honorary member of the Legion of Super Heroes.
The theoretical purpose of the machine was to test if time's flow was circular - sending Rugarth into the distant future so he would travel full circle back to his starting point.
Unfortunately, the machine was even more powerful than Vidar foresaw and Rugarth repeatedly circled time until he changed into the incredibly powerful being known as the Infinite Man. Whatever forces actually wrought the changes may be unknown, but Rugarth now possessed tremendous control over the fabric of time itself, and he used these powers to seek revenge on Rond Vidar.
The members of the Legion of Super Heroes managed to prevent the Infinite Man killing Rond, and sent him back to circle endlessly through time. Later during the Crisis on Infinite Earths, the Infinite Man found he could utilise energies given off by the Anti Monitor to free himself. In the resulting battle with the Legion, those energies and the ones that originally turned Rugarth into the Infinite Man were stripped, and he returned to normal.