The Kazon return in “State of Flux”, as the crew tries to solve the mystery of why everyone on a Kazon ship is dead. Then, in “Heroes and Demons”, the Doctor finally gets his moment in the limelight. Shame about the rest of the episode.
Trekabout Episode 243: State of Flux/Heroes and Demons

CrM
-Apropos of little, but if you folks ever reach such a low point in Voyager that you need a pallette cleanser so utterly awful that it makes even the worst of Voyager look good, Babylon 5 is now available for free streaming in the US: https://www.go90.com/shows/babylon5 .
Eric Brasure
-You are my new favorite commenter. 🙂