A strange godlike being who traveled from the delta quadrant to test the mercy of humanity brings the Tuvix flower with him and spreads it aboard the enterprise. Most of them are vacuumed up by ensigns but one makes it into the teleporter when Scotty and Spock are transporting. Creating Scock. The rest of the episode is about convincing this new live form to call himself Spotty
Mirror universe from the universe where the Borg have taken over the Federation and all that’s left is scraps of the fleet.
Every episode opens assuring us the Borg have a plan but it becomes increasingly apparent the closer you get to season 5 that neither the Borg nor the showrunners had much of one