Patrick Stewart is reprising his role as Jean-Luc Picard in the new TV series “Picard,” where the writers have promised a very different storyline on his arch nemesis The Borg. In our final installment on villains, we discuss why The Borg are a unique existential threat to the Star Trek ethos with the help of three academics who combine science fiction with philosophy in their courses. Featuring Kevin Decker and Christina Valeo of Eastern Washington University and Shawn Taylor of San Francisco State University.