This episode takes place completely aboard Voyager--usually a sign that it's a crappy show. However, this one is actually excellent. The show begins with the body of a murdered crew member being discovered. Crewman Suder is soon identified as the killer and this Betazoid soon admits he did it and it seems that he murdered because he enjoyed killing. As Tuvak is in charge of the case, he's completely perplexed as this sort of antisocial thinking is completely un-Vulcan. So, he attempts to use a mind meld to help Suder to become more normal as well as understand him. Unfortunately, this also turns Tuvak into an antisocial personality with a strong desire to kill--Neelix in particular (which is VERY understanding). What's to become of these two crazed crew members?
Brad Dourif stars as Suder and this is VERY interesting, as he played a murderer on "Babylon 5" as well--one who is captured and who is punished in a most unusual and interesting manner. Either way, this is a fascinating episode of "Star Trek: Voyager" and worth seeing.