Ghost

"We've only been here for a couple of days. This stuff is pretty old. It's that, or there really are ghosts."

- Dr. Rodney McKay

A ghost is the soul or spirit of a deceased person, taken to be capable of appearing in visible form or otherwise manifesting itself to the living. Descriptions of the apparition of ghosts vary widely: the mode of manifestation can range from an invisible presence to translucent or wispy shapes, to realistic, life-like visions. Many of the Athosians believed the spirits of the Ancestors inhabited Atlantis.