Picard's archnemises Q returns requesting to join the starship Enterprise as a full officer. Picard of course refuses which results in Q proving to them that they need him by forcing them into a battle with the unknown and very powerful Borg.
It was a very cool episode, but then again all episodes with Q are. It was wierd how it said that the bartender Guinan knew Q very well and that they had gotten into a big argument two hundred years ago. The introduction of the Borg species was a cool thing star trek's creators did. However, it was very strange how after Picard admitted he needed Q's helpand Q saved them from the Borg Q didn't ask to join the Enterprise crew again, but instead just vanished like he usually does. I think it was an important Star Trek episode.