This is one painful movie to watch. The only character to cross over from Superman is the guy who played Jimmy Olsen and you can see why no one else would want to be seen in this one. They seem to change a lot of things around that were clearly established in the Superman series and then there is the horrible plot as well. Supergirl played by Helen Slater who is probably a good choice to play the role must retrieve a ball that keeps her people alive in inner space or something. All I know is that Supergirl somehow gets to earth by way of a lake. The ball falls into the hands of Faye Dunaway who somehow knows how to use it and she does all sorts of evil things as she is trying to get a younger guy to like her (kind of desperate, eh?). She somehow even sends Supergirl to the phantom zone...in Superman it was a mirror in space; here it is an entire world. All in all this one just suffers from a really bad script and very bad overacting as well. I have only seen the original theatrical release however, and not the 140 minute cut which may explain a few of my complaints.
