This is probably the greatest day of Sam Worthington's life.

Today at CinemaCon in Las Vegas, James Cameron made an appearance at the 20th Century Fox presentation and announced that the Avatar universe was too vast for just three sequels and that four will be coming to cinema screens in the next seven years.

"We’ve begun to bump up against the limitations of our art form," said Cameron. "There’s just too much story."

"It's going to be a true epic saga that's told in this rich and complex world."

While we've seen previous release dates for 'Avatar' sequels be pushed back a few times, Cameron is insistent that the four sequels will come in on time, with release dates promised for Christmas of 2018, 2020, 2022 and 2023.

Cameron also told the crowd in attendance that "Each one of which stands alone, but which together form a complete saga." While that may mean we won't be seeing/hearing from Sam Worthington and Zoe Saldana in each of the four films, they're still probably going to appear in some shape or form which probably made them, their agents and their accountants all very happy today.

Via EW/The Verge