Meskipun Avatar 2 baru akan rilis pada 2020, James Cameron mengungkap bahwa karakter Colonel Quartich, yang diperankan oleh Stephen Lang akan menjadi antagonis utama dalam 4 sekuel Avatar.
"The interesting conceit of the Avatar sequels is it’s pretty much the same characters,"
"There are new characters and a lot of new settings and creatures, so I’m taking characters you know and putting them in unfamiliar places and moving them on this greater journey."
"But it’s not a whole bunch of new characters every time. There’s not a new villain every time, which is interesting. Same guy. Same motherfucker through all four movies. He is so good and he just gets better. I know Stephen Lang is gonna knock this out of the park."
- Kutu Butara