It has been announced that 'Titanic' director James Cameron will begin principal photography on his new film 'Avatar' in April.

Described as a sci-fi adventure movie and "an emotional journey of redemption and revolution", 'Avatar' is Cameron's first feature film since the Oscar-winning 'Titanic'; it will be shot in 3D for release in the new digital 3D format.

The film tells the story of a wounded ex-marine who joins the indigenous people of an exotic planet in their battle against those who want to exploit its resources.

'Avatar' is due for release in 2009 and will star Australian actor Sam Worthington and American actress Zoe Saldana in the lead roles.

Commenting on the film, Cameron said: "For me, as a lifelong fan of science fiction and action, 'Avatar' is a dream project. We're creating an entire world, a complete ecosystem of phantasmagorical plants and creatures, and a native people with a rich culture and language. The story is both epic and emotional."