film, he would give the character "a quality that is really real". Cameron said he "has that quality of being a guy you'd want to have a beer with, and he ultimately becomes a leader who transforms the world". Cameron offered the role to Matt Damon, with a 10% stake in the film's profits, but Damon turned the film down because of his commitment to the Bourne film series. Worthington also briefly appears as Jake's deceased identical twin, Tommy. Zoe Saldana as Neytiri te Tskaha Mo'at'ite, the daughter of the leaders of the Omaticaya (the Na'vi clan central to the story). She is attracted to Jake because of his bravery, though frustrated with him for what she sees as his naiveté and stupidity. She serves as Jake's love interest. The character, like all the Na'vi, was created using performance capture, and its visual aspect is entirely computer generated. Saldana signed on for potential sequels. Stephen Lang as Colonel Miles Quaritch, the head of the mining operation's security detail. Fiercely consistent in his disregard for any life not recognized as human, he has a profound disregard for Pandora's inhabitants that is evident in both his actions and his language. Lang had unsuccessfully auditioned for a role in Cameron's Aliens (1986), but the director remembered Lang and sought him for Avatar. Michael Biehn, who had worked with Cameron in Aliens, The Terminator and Terminator 2: Judgment Day, was briefly considered for the role. He read the script and watched some of the 3-D footage with Cameron but was ultimately not cast. Michelle Rodriguez as Trudy Chacón, a combat pilot assigned to support the Avatar Program who is sympathetic to the Na'vi. Cameron had wanted to work with Rodriguez since seeing her in Girlfight. Giovanni Ribisi as Parker Selfridge, the corporate administrator for the RDA mining operation. While he is at first willing to destroy the Na'vi civilization to preserve the company's bottom line, he is reluctant to authorize the attacks on the Na'vi and taint his image, doing so only after Quaritch persuades him that it is necessary and that the attacks will be humane. When the attacks are broadcast to the base, Selfridge displays discomfort at the violence. Joel David Moore as Dr. Norm Spellman, a xenoanthropologist who studies plant and animal life as part of the Avatar Program. He arrives on Pandora at the same time as Jake and operates