Development of the wildly successful Avatar actually began in 1994, and between the development of the Na’vi language and visual effects technology, it took 15 years to finish. Avatar went on to become the highest-grossing film of all time, surpassing Titanic and maintaining its status until the release of Avengers: Endgame. However, a theatrical re-release earned Avatar its first place, back, grossing USD$2.84 billion in total.