UK, December 12, 2007 - Fox has pushed back the release date of James Cameron's sure-to-be huge 3-D sci-fi epic Avatar six months, from May 22nd to December 18, 2009.

According to Variety, the delay is to give the Titanic-helmer more time to work on the live-action/CGI production's digital effects, as well as to allow additional theatres to install 3-D screens.

A spokesman for Fox told Variety: "Making this change more than two years out allows Weta to achieve this unparalleled cinematic feat with the most efficient completion of the digital effects." He also revealed that Cameron has almost completed principle photography in New Zealand.

- Eric Charbonneau/
James Cameron has an extra six months to work on Avatar.

Avatar's plot reportedly revolves around a paralyzed former marine who undergoes an experiment to exist as an "avatar" -- another version of himself. He is then shipped off to battle an alien army on a distant planet. Sigourney Weaver, Giovanni Ribisi, Michelle Rodriguez and Sam Worthington are set to star.

Fox's replacement for Avatar on the Memorial Day weekend will be Night at the Museum 2: Escape from the Smithsonian -- a sequel to the CG-heavy original about Ben Stiller's security guard who gets stuck inside a museum full of exhibits that come alive.