Plutonium

"Once again, the threat to Earthrealm has been vanquished. The Deadly Alliance is no more. What dangers lie in the future, I can no longer foresee. Perhaps the Dragon King will, in fact, return. Perhaps the depths of the Netherealm will spew forth a legion of Oni. Even the Vampire people pose a threat to peace now that Outworld is in chaos. But one thing is certain... Earthrealm must be protected. I have abandoned my status as Elder God to aid these mortals... an act defiant of the Heavens. I will instead remain here on Earth... as GOD OF THUNDER."

-Raiden, Mortal Kombat Deadly Alliance"