This episode won an Emmy Award for Outstanding Special Visual Effects for a Series, beating out The Council (2004).
T'Pol calls Charles Tucker III "Trip" for the first time in the series in this episode.
This episode was directed by Robert Duncan McNeill, who played Tom Paris in Star Trek: Voyager (1995).
The parasites used on Hoshi were similar in effect to the Ceti eels put into Chekov's ear in Star Trek II: The Wrath of Khan (1982), which also made their victims more compliant.