James Cameron Explains Why 'Avatar' Aliens Are Blue

'Green had been taken by all those Martian movies with the little green men,' the director jokes.

Moviegoers got a [article id="1627534"]sneak peek at one of the year's most anticipated films[/article] on Thursday, straight from legendary director Jim Cameron himself. Unsurprisingly, when the "Avatar" director held court for an exclusive MTV Q&A online, one of the most eye-opening questions came from a fan.

"Jim, what inspired you to make the Na'vi blue?" asked Sarah T., one of the many moviegoers who logged on to to watch the chat.

"Well," the director of such classics as "Titanic" and "Aliens" began. "We wanted to say that there was an otherness, an alien-ness to them. But we wanted to keep them human enough that we could understand their emotions. So, they were going to have two eyes, and they were going to have a mouth."

Cameron made a point to say that he took particular pride in creating the wholly original world of "Avatar" at a time when so much of Hollywood is spinning their wheels with sequels, remakes and adaptations of old material. And, like his best films, he made sure that a romantic subplot was in the mix -- which placed added requirements on the Na'vi character Neytiri, played by Zoe Saldana.

"At a certain point, we realized this is going to be a love story," he explained of Neytiri's relationship with Jake Sully, a human-in-Na'vi-form portrayed by Sam Worthington. "So, Zoe's character had to be beautiful and accessible and relatable emotionally."

Looking over at his fellow Q&A participants -- the Dominican/ Puerto Rican Saldana and Western Australian Worthington -- the Canadian-born Cameron said that the Na'vi's blue skin also allowed him to comment on race. "[I was thinking], 'What are the differences that we can deal with, without it becoming a barrier?' Skin color is great, and it's also great thematically, because skin color is obviously such a big issue on our planet," he explained with a grin, looking at his actors and teasing Worthington. "All the warm tones -- from pallid Canadian pink, to beautiful warm browns and, well, pallid Australian pink -- were all taken.

"So, we were down to blue and green basically -- and green had been taken by all those Martian movies with the little green men," he remembered of his reasoning. "So, we have big blue women, not little green men."

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