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The actor, who played the masked Darth Vader, is said to have annoyed creator George Lucas during the filming of the original trilogy by leaking film plots. Prowse has claimed that Lucas promised to show his face when Vader's mask was removed - but another actor was ultimately used.
Writing on his website, he said that he is not allowed to attend an upcoming Star Wars convention - or any other "Lucasfilm associated event".
He added: "The only thing I've been told is I've burnt too many bridges between Lucasfilm and myself."
A friend of the actor said: "Dave never received much money for his role and was always shoved to the side. He believes he's been an embarrassment or annoying to Lucas.
"But he lives for conventions. So to strip this from him too is heartbreaking."
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