Star Trek: The Next Generation – Force of Nature [7.9]

Attempting to find a missing medical ship, the Enterprise encounter two scientists who claim their world is being threatened by the continued use of warp drive. 

Star Trek: The Next Generation – I, Borg [5.23]

The Enterprise picks up a wounded Borg drone, and in spite of Picard’s misgivings, end up calling him Hugh.  Picard wants to take advantage of the situation to use the drone as a way of carrying  destructive virus back to the Borg collective, but the crew becomes increasingly uncomfortable with this plan as Hugh develops more and more individual characteristics.