Stars Sigourney Weaver, Sam Worthington and Zoe Saldana were expected to join the crowds in London's Leicester Square before Thursday's gala screening.
The 3-D epic about humans taking extraterrestrial form as they explore a distant world is reportedly one of the most expensive movies ever made, with a price tag well in excess of the $200 million spent to make "Titanic." It uses cutting-edge digital technology to create dizzying special effects.
Cameron conceived the story for "Avatar" in 1995 then waited a decade for technology to catch up so he could film it. The film mixes live action and computer animation to create an eye-poppingly vivid alien world.
The industry is watching closely to see how audiences respond to Cameron's first narrative film since 1997's "Titanic," which won 11 Academy Awards and has taken $1.8 billion worldwide at the box office.
"Avatar" opens around the world next week.
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