What part of the plot was not original?
Discovery of a unknown world?
Love between two people from different worlds?
Conflict of Good and Evil?
Use of a advanced weaphons against bows and arrows?
Demoralization in a militarily organization?
Genetic engineering.
Cloning of a higher life form?
Genocide?
Swing on vines?
Save my trees?
Stupid man meets smart woman?
The above plot lines are so broad, it would be hard to do a modern movie without them.
I thought the plot was very original in how the main guy gets back the trust of the people. He jumps on a great bird and flies in to the rescue. Or did somebody already do that? Yeah, but that was a cartoon.