Filmmaker J.J. Abrams, speaking on video from the Abu Dhabi set where his "Star Wars: Episode VII" is shooting, introduced a Disney/Lucasfilm charity initiative by announcing an opportunity for a fan to appear in the movie.

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"We're so grateful to all the 'Star Wars' fans out there for their support and their patience that we would like to invite you to be part of the fun" in the London portion of the production, Abrams said. "We want to put you in the movie," offering the winner of a sweepstakes the chance to meet the cast and go through hair, makeup and wardrobe treatment to become a character.

The Star Wars: Force for Change campaign benefits the United Nations Children's Fund (UNICEF) Innovation Labs programs. For each contribution of $10 or more made through the Venice, Calif., charitable crowdsourcing company Omaze at, eligible participants will be automatically entered for a chance at the grand prize, which includes airfare and accommodations for the winner and a guest.