The unique Avatar tackled matters like colonialism, exploitation, nature and so forth. Sam Worthington, Zoe Saldana, Stephen Lang, Michelle Rodriguez, and Sigourney Weaver performed the principle roles. Giovanni Ribisi, Joel David Moore, Dileep Rao, CCH Pounder, and Matt Gerald appeared in supporting roles. All of them will return within the sequels, together with Weaver in a brand new position. (Picture: Avatar/Twitter)