It's been over a decade since James Cameron's sci-fi epic Avatar first hit theaters and destroyed box office records. Since then, it became the highest-grossing film of all time, lost that title to Avengers: Endgame, then reclaimed it after a re-release. It's also become a meme as the "the most popular movie no one remembers."
Now that its sequel Avatar: The Way of Water is making its way into theaters, it's high time for a refresher on the lore underpinning Cameron's universe. Here's a crash...