Ra's al Ghul
Born over 600 years ago, the man known as Ra's al Ghul was a physician who discovered a process for immortality using unique chemical pits occurring over magnetic ley lines. These "Lazarus Pits" can resurrect the dead, and have allowed Ra's to renew his life for centuries.
Ra's has spent his lifetime creating a criminal organization to support his goal of saving Earth from the polluting and corrupting ways of Man. He constantly works towards the genocide of the world's population, leaving a small portion behind to live in harmony with nature. Ra's greatest foe is Batman, whom Ra's considers his intellectual equal.