also known as the origin of Halloween, is a special type of [[ demon]].
When he reigned on Earth on Halloween night, people kept their children in that night, they wore masks to hide from him, carved pumpkins to worship him, and left sweets at their doors to appease him.<ref name="four07" >[[4.07 It's the Great Pumpkin, Sam Winchester]]</ ref>
He can be summoned out of the confines of [[ Hell]] by two [[ witches]] through three human sacrifices over three days, the last of which must occur on the final day of Celtic harvest, the 31st of October, the American Halloween. This ritual can only be attempted every six-hundred years. Once Samhain rises, he is able to summon [[ ghosts]], [[ zombies]] , and [[ ghouls]] from the depths of the Pit and unleash these morbid entities on the world. He was released centuries ago but was [[ exorcise]] d by an unknown force, sending him back down to [[ Hell]]. In 2008, Samhain was summoned by two [[witches]] - [[Tracy Davis]] and [[ Don Harding]]. He used the dead body of Don Harding as a [[vessel]].