Interstitials were creatures that were created through a temporal anormally. Interstitials were living in a state relating to the space or time between things. They were neither dead nor alive, they were beings but not beings and they existed without life.
K9 once meets these creatures. Once they had been colonists heading for the twin planets when they had collided with a ship doing warp speed. This had caused a temporal anormaly. There had nothing left exapt a cloud and the people. The people asked K9 for his help to rejoin the livestream. K9 tried to help them by letting them pass into another existence, where it was better for them. (PROSE: Interstitials)