The premise of Miracle Day sounded a little familiar when I first heard it and despite seeing a similar premise on an episode of Xena, you may be interested to know that the story is actually an old one. Thousands of years old in fact. Over on the forum, Roranicus has summed up the Greek Myth brilliantly, so I will hand you over to her:
In Greek Myth there are a few instances where this occured. Most famous is probably Sisyphus who was forced to push a boulder up a hill and then watch it roll back down for all eternity.So as you see, the premise, if not the whole story, is very similar and with the Grim Reaper and incarnations of the Devil having previously made cameos, this could very well be how Miracle Day happens. What do you think?
Sisyphus was a bit of a troublemaker and Zeus decided to have him banished to the underworld. When Thanatos (sort of a modern day grim reaper) came to claim Sisyphus for the underworld, he knew he would not be taken easily, so he took with him a pair of handcuffs in order to chain Sisyphus, however Sisyphus played the fool and pretended like the handcuffs were the most amazing and intriguing thing ever and asked Thanatos to show him how they worked. Thanatos was obviously not too bright because he tested them out on himself. Sisyphus then locked Thanatos in his house for days and in this time nobody could die. Soldiers in battle who were mortally wounded stayed wounded and dying but didnt pass over. The elderly and the sick the same. The general populace just thought that a miracle had happened and the gods were smiling down on them, but gradually it came to be not such a great thing and the storehouses and winery's all quickly ran out of resources and there wasnt enough room for all the people. In the end, Ares became frustrated that his wars were becoming boring and so freed Thanatos in order for him to take Sisyphus to the underworld.