The Borg: defining Star Trek’s most ambiguous enemy

The Borg are the ultimate enemy because they defy definition. They are whatever the plot requires them to be, from a frightening new adversary to even an ally. Since they were first introduced to Star Trek canon in The Next Generation episode ‘Q Who?’ in 1989, the Borg have served as a foil for The United Federation of Planets, a dark reflection of Starfleet ideals.