The Enterprise has picked up weak distress signals from the unexplored moon of Mab-Bu VI. The moon was thought uninhabited, and electromagnetic whirlwinds move over the satellite's surface.
	The non-corporeal prisoners were brought to the moon over 500 years ago from the Ux-Mal system. The penal colony contains hundreds of criminals who have been deprived of their bodies as punishment.
	Jat'yIn - "the talking of the living by the dead" is a Klingon spiritual possession legend.
	Daedalus-class starships went out of sevice 172 years ago.
	The U.S.S. Essex NCC-173 was commanded by Captain Bryce Shumar. His first officer was Stephen Mullen and the security chief was Lt. Morgan Kelly. The ship had a crew compliment of 229, and Shumar reported to Admiral Utan Narsu at Starbase 12 (see "Conspiracy" and classic Trek's "Space Seed").
	Riker has broken his arm before.

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