This preachy episode involves efforts by a female alien to get starships to stop using a corridor in space. She claims the use of warp drive is damaging the fabric of space. To prove her point she destroys herself. The investigation into this is what this episode is about. The dramatic use of subterfuge to prove their point could made the brother and sister true terrorists. Of course, what they want is for the powers that be to listen to them before it is too late. This episode is really heavy handed. It would seem that their ultimate findings were quietly ignored. There are just too many unanswered questions in this presentation.