Batman discovers a mysterious teen-aged girl with super-human powers and a connection to Superman. When the girl comes to the attention of Darkseid, the evil overlord of Apokolips, events take a decidedly dangerous turn.
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If you're of the belief that Superman is a candy-ass as I was up until a few years ago, this movie is worth looking into. For the most part, you may as well forget that Batman's in it as for the most part it feels like the Superman/Supergirl show. There are some great fights (namely between Superman and Darkseid) and the story has its moments but I can think of several other books DC should have made before this.