John Constantine has been able to see demons since he was a child. Nobody really knows why. Unfortunately for him, it has led everyone he knew to think that he was crazy, so he tried to kill himself. He was legally dead for two minutes, but then resuscitated. This leaves him damned in the eyes of God, having committed the deadly sin of suicide. In a quest for redemption of the highest order, Constantine spends his time banishing demons back to the plane of Hell to make the world a better place and find himself in Heaven as a reward.