"Each movie will introduce audiences to new biomes," producer Jon Landau previously told Entertainment Weekly. "Each movie is going to introduce audiences to new clans, new cultures on Pandora. Once we introduce a character, they stay a part of the ongoing evolution. We just add to it."

The Avatar universe is finally ready to unleash its next chapter, and it’s bringing a major twist to the story of Pandora. After years of waiting since ‘Avatar: The Way of Water’, fans have now been given a glimpse into ‘Avatar: Fire and Ash’,

Still, it's understandable if you're in need of a refresher about that past, present and future of Cameron's corner of the galaxy. Here's everything you need to know about Fire and Ash before you catch the trailer in theaters.