Disappointed when this real good show was canceled and this episode demonstrated that they could, even in the first year, make some good TV. Although there is not enough of an explanation as to who is attacking the Enterprise in this, it did set up the realisation of how dangerous space and it's vastness was. When they decide to return to Earth because of a superior enemy, Trip pulls out the stops to improve the weapons on the ship and the crew pull together and eventually improve the ship's defences to such a level that a return home is unnecessary. Such a character driven show, and one that did the rare thing of creating a 'comfortable with each other' situation. The closing scene is warm and friendly and capped a brilliant episode.
Review of Silent Enemy
