Avatar cast reveals a few new secrets about the sci-fi epic

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Dec 14, 2012, 4:09 PM EST

Director James Cameron and the cast of Avatar reveal a few new secrets to us about the epic sci-fi movie in these exclusive video interviews from London.

"You can't describe this movie. Are you kidding? You've got to go see it," Cameron says. He adds: "I think when you come out of the movie and you know exactly what it is, you can't describe it."

Sam Worthington talks about creating the performance of his computer-generated character. And Zoe Saldana demonstrates her Na'vi language skills: "I was breaking everything down phonetically, and that was tons of fun, and it wasn't as hard as speaking English with a Na'vi accent."

Avatar opens today.