LIGHT YEARS BEYOND TOMORROW...
In the distant future, the planet Metropolis is a peaceful utopia led by The Great Brother. His reign is threatened, however, by Graal. Graal enlists the help of a mad scientist named Dr. Kraspin, who has a plan to make unstoppable supersoldiers he calls "Humanoids." For this he requires Kapitron, a powerful element that is kept at the Grovan Institute on Metropolis.
That "probably" in your first sentence is doing a lot of heavy lifting :D
I wonder why George Lucas never sued them. In some parts it's such an obvious clone, near to a remake.
I mean, I doubt this movie made a lot of profit, so I don't think suing them would be very beneficial?
You're right. Could have given them credibility and publicity Lucas didn't want to hand out.