Originally printed in:

• JUSTICE LEAGUE OF AMERICA #212 (Mar 1983) DC Comics
  

With the help of the Phantom Stranger, the Justice League battles the invading War-Kohn on multiple fronts and frees George Arthur Stuart from captivity. Defeating the aliens, after the previously wounded Elongated Man and Red Tornado provide information vital to their downfall, the JLA heroes learn that Stuart’s unique genetic code contains the cure for the humans and animals transformed by the X-Element decay-reversal process. The cure is administered, David Dorman is reunited with his fiancée, and all is well…at least until the day when the X-Element will again begin to decay.