The movie "Avatar" from 2009 is a sci-fi film directed by James Cameron. It is noteworthy not only for its storyline and visual effects but also for its outstanding cast. Here are the main and noteworthy supporting actors: 1. **Sam Worthington** as Jake Sully: Sam Worthington plays the main character, Jake Sully, a former Marine who is paralyzed from the waist down. Sully undergoes an experiment to inhabit an Avatar, allowing him to walk again and live amongst the Na'vi. 2. **Zoe Saldana** as Neytiri: Zoe Saldana portrays Neytiri, a Na'vi huntress, and eventually becomes Jake Sully's love interest. Neytiri is the daughter of the tribal chief. 3. **Sigourney Weaver** as Dr. Grace Augustine: Sigourney Weaver acts as Dr. Grace Augustine, the head of the Avatar Program and a botanist, passionate about studying and preserving the ecology of Pandora. 4. **Stephen Lang** as Col. Miles Quaritch: Stephen Lang portrays Col. Miles Quaritch, a fierce and ambitious military man who is the head of the security detail made for the human's mission on Pandora. 5. **Michelle Rodriguez** as Trudy Chacon: Michelle Rodriguez's character is Trudy Chacon, a combat pilot who later aids Jake in his mission to save Pandora. 6. **Giovanni Ribisi** as Parker Selfridge: Giovanni Ribisi plays Parker Selfridge, a corporate administrator of RDA on Pandora. These are the primary actors, but many other talented actors played smaller roles as well. All the performances contributed to creating the enthralling world of Pandora and ensuring the success of James Cameron's "Avatar".