20th Century Fox (via avatarmovie.com)

In a week history will remember as the shortest span of time to feature the most movie release date readjustments ever, Avatar 2 has been delayed "indefinitely." It was originally set for Christmas 2016, then Christmas 2017; the Wrap cites a source close to the production, although 20th Century Fox would not comment. 

Titanic and Terminator 2 director James Cameron has spent years talking up three movies to follow his 2009 original, which put 3D filmmaking on the map and became the world's biggest movie of all time. Avatar 3 was potentially set for 2018, while 4 would have come out in 2019. 

"The director is known for being a perfectionist and an advocate of developing new technology to advance the craft, both traits that could potentially delay the process," the Wrap writes, adding that Cameron said last month that everything was on schedule. Stars Sam Worthington and Zoe Saldana signed three-movie contracts in 2014.

Avatar was only the second movie to ever pass $2 billion worldwide, blasting past Titanic's $2.18 billion to land at $2.78 billion. Star Wars: The Force Awakens is currently making a play for Titanic's spot, amassing $1.88 billion in the last month. The sequely, Episode VIII, was delayed earlier this week by seven months