One story says that, on that day, the disembodied spirits of all those who had died throughout the preceding year would come back in search of living bodies to possess for the next year. It was believed to be their only hope for the afterlife. The Celts believed all laws of space and time were suspended during this time, allowing the spirit world to intermingle with the living.

History traces Halloween back to the ancient religion of the Celtics in Ireland. The Celtic people were very conscious of the spiritual world and had their own ideas of how they could gain access to it - such as by helping their over 300 gods to defeat their enemies in battle, or by imitating the gods in showing cleverness and cunning.