The producers of the next "Star Wars" movie are inviting fans to join them on the next galaxy adventure. Director J.J. Abrams appeared in a video from the set of the new movie Wednesday, announcing a challenge that will give fans the chance to appear in "Star Wars 7," which began production in London earlier this week.

It's part of the just-launched "Star Wars: Force Of Change" initiative, which aims to raise funds for UNICEF's Innovation Labs. Abrams is encouraging fans to donate toward the initiative's one-million-dollar goal for the opportunity to visit the movie's set. "Star Wars 7" is on track to arrive in theaters in December 2015. Find out how you can enter for your chance to win!