This is the only time the crew of the Enterprise use their green-glowing night vision gear.
The bottles of liquid the Eska possess appear to be re-used "bloodwine" bottles from Star Trek: Deep Space Nine (1993).
The title refers to an object the size of a planet that is not in the gravitation sphere of a star and travels about the galaxy on its own path.
Eric Pierpoint read for the role of William T. Riker on Star Trek: The Next Generation (1987) as well as for the lead roles on Star Trek: Deep Space Nine (1993) and Star Trek: Voyager (1995).