Unfortunately I can't get much out of this episode. It feels a bit like an X-Files episode: On a Malon freighter that is about to explode and scatter its toxic cargo across light years, the bogeyman seems to be up to mischief - an old legend among the Malon: A supernatural being that lives in the toxic waste and draws its life force from it. But in the end it's just a pretty irradiated crew member who survived by luck and is now out for revenge because the crew left him behind to die.
Voyager sends Torres, Neelix (coincidentally, Neelix has also worked on waste disposal ships and is naturally ideally suited for this job) and Chakotay, along with two Malon crew members who were previously rescued, onto the freighter to prevent the impending disaster. The episode then plays a bit with scary moments, darkness, green gas, strange noises, an attack out of nowhere, a dead person... and then at the end the bogeyman is unmasked and overwhelmed. Pretty lame story.
Torres is also extremely annoying in this episode. She acts like a spoiled, angry little brat who no longer has control over her emotions and snaps at everyone. Also: What about the relationship between her and Paris? You can't see any chemistry between the two anymore. There is absolutely nothing there. Break up finally!