http://screenrant.com/darkest-star-trek-episodes-ever-all-time-ranked/

Gene Roddenberry’s hopeful ideal for humanity’s future was definitely not filled with sunshine and rainbows.

Interesting article except for the author's inexplicable and obvious hatred for Voyager. I like Voyager and I think it was a great series. Does it have some lame episodes? Yes, but then all of the Trek series do. But he did pick some good examples of "dark" episodes.

Ed.