Matthew Tyler is Hourman, an android from the 853rd Century.
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History
He was created by Tyler Chemorobotics using genetic software that is patterned after the Miraclo-enhanced DNA of Rex Tyler, the original Golden Age Hourman. Thus, while this Hourman is a machine, he nonetheless qualifies as a 'descendant' of Rex Tyler's. In the year 85,271 A.D., Metron of the New Gods will appoint the young android as his heir and entrust him with the Worlogog , an artifact that can control and manipulate time itself. But Hourman forsook his post as Metron's apprentice and traveled back to the 20th Century to explore his human heritage alongside the Justice League.