http://en.wikipedia.org/wiki/Battlefield_Earth_%28film%29#Plot
The film depicts a greedy alien security chief, Terl (Travolta), who
enslaves human prisoners to mine gold for his people. Barry Pepper
plays Jonnie Goodboy Tyler, a human (or "man-animal", as the
"Psychlos" named them) who decides to liberate his people by fighting
the "Psychlos". The plot follows roughly the same lines as the
original book, though with some major omissions and simplifications.
The film ends approximately one half of the way through the book, with
the destruction of Psychlo and liberation of the Earth.
Travolta originally saw himself in the role of Tyler, but by the time
the movie was actually made, Travolta felt he was too old to play the
role, and took the role of the main villain instead.[3]


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