US actress Carrie Fisher (R) poses with a storm trooper as she attends the opening of the European Premiere of "Star Wars: The Force Awakens" in central London on December 16, 2015. Ever since 1977, when "Star Wars" introduced the world to The Force, Jedi knights, Darth Vader, Wookiees and clever droids R2-D2 and C3PO, the sci-fi saga has built a devoted global fan base that spans the generations. 
AFP PHOTO / LEON NEAL / AFP / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)