3. Species 8472 Changes the Game
From fluidic space, a dimension outside the known Star Trek universe, emerged Species 8472. Discovered by The Borg, Species 8472 was unknown to Star Trek space until The Borg invaded their fluidic space in an attempt to assimilate their technological and biological distinctiveness into their own. How'd that work out, you ask? Yea, not so good: Species 8472's complex triple helix DNA structure allowed them to forego and avoid assimilation, and practically destroy The Borg at will. As a result, Captain Janeway forms an alliance with The Borg: allow Voyager safe passage through Borg space, and Voyager will help with a nanotechnology answer to the Species 8472 threat. The result gives us the first and only Borg/Federation alliance, and the retreat of Species 8472 back to fluidic space.