Observing that the green meteorite endowed Super-Soldier with his powers, Luthor creates a serum from it and injects it into himself; the serum greatly extends his own lifespan, but inadvertently turns him into the cadaverous Green Skull.
Observing that the green meteorite endowed Super-Soldier with unlimited powers, Luthor creates a serum from the radioactive rock and injects himself with it. The result greatly extends his own lifespan, but inadvertently transforms him into the cadaverous Green Skull.