I just watched "The Drumhead" (Star Trek: The Next Generation Season 4 Episode 21).
This episode epitomizes why I value this series so much. The writers were able to create timeless content surrounding topics of moral and ethical conduct. It amazes me that our world has made so many strides and yet the same pitfalls remain. If you have not watched Star Trek in a while and think you might have time for an episode, I would encourage you to consider this one.
