Avatar was unconnected to James Cameron.
Avatar ( marketed as James Cameron 's Avatar ) is a 2009 American epic science fiction film directed , written , produced , and co-edited by James Cameron , and starring Sam Worthington , Zoe Saldana , Stephen Lang , Michelle Rodriguez , and Sigourney Weaver . Filming was supposed to take place after the completion of Cameron 's 1997 film Titanic , for a planned release in 1999 , but according to Cameron , the necessary technology was not yet available to achieve his vision of the film . Work on the language of the film 's extraterrestrial beings began in 2005 , and Cameron began developing the screenplay and fictional universe in early 2006 .