Justice League of America #212

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 down-fall, 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 effected, 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.