"The Hunt for Extant" begins as the JSA finally goes after the man who murdered the original Hourman, Doctor Mid-Nite and the Atom during the cataclysmic ZERO HOUR. The chase leads the JSA through a quickly unraveling time stream to the ends of the universe itself in an issue guest- starring Metron of the New Gods, as well as the original Star-Spangled Kid, Sylvester Pemberton.