Avatar. Pic/ Santa Banta

Cameron said as he was planning the three sequels, he found it limiting.

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"We began to bump up against the limitations for our art form," he said, explaining that he decided he would need more instalments to tell the whole story.

Cameron said each of the four sequels will be able to stand alone, but will together create a saga. His goal is to release "Avatar 2" at Christmas 2018 and then a new film in 2020, 2022 and 2023.

"I've been working the last couple of years with a team of four top screenwriters to design the world of Avatar going forward: the characters, the creatures, the environment, the new cultures.

"So far, the art I'm seeing is, in pure imagination, really far beyond the first film. It's going to be a true epic saga," he added.