|“Those are the Old Souls. The ones taken by the Maw before my time.”|
|— Nehmaar Reem to Jack and Parker, "Night of the Harbinger"|
- Some of the Old Souls appear to be Shadow-Walkers.
- They vanish into purple smoke when they, like the Maw, are destroyed, rather like the ghosts the Paranormal Intercept Bus 3000 ran into in "The Lighthouse, Part 2".
- They are ghosts, but they aren't Sad, Wild, or Anger Ghosts; their color is purple.