Go inside the world of 'Avatar' with James Cameron, Zoe Saldaña, Kate Winslet, Sigourney Weaver, Sam Worthington and Miley Cyrus! The 20/20 special airs Dec. 12th on ABC. Stream on Disney + and Hulu. --- Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G Watch 24/7 coverage of breaking news and live events on ABC News Live: https://www.youtube.com/watch?v=gN0PZCe-kwQ&ab_channel=ABCNews Watch full episodes of World News Tonight with David Muir here: https://youtube.com/