Sigourney Weaver confirmed to entertainment website Showbiz411.com, that James Cameron intended to produce a four-part saga.

While promoting TV series Political Animals, Sigourney Weaver put an end to the endless speculation about the future of Avatar.

The actress will indeed be involved in the new films despite the death of her character, Grace Augustine, in the first instalment. Weaver also confirmed rumours that James Cameron had decided to extend the futuristic eco-fable to four parts, after having originally intended to create a trilogy.

The first sequel to Avatar, the biggest box office success in the history of cinema with takings of $2.78 billion, is not scheduled to arrive in theatres until the end of 2014, or even the following year.

This is taking into account the long post-production process needed to bring to life the graphic effects of the flora and fauna of planet Pandora as well as its blue inhabitants, the Navi.