<P> Neville once again attempts to administer a potential cure to the infected woman in his laboratory, but the next night, a group of Darkseekers, who had followed Anna and Neville back the night before, attacks the house . Neville, Anna, and Ethan retreat into the basement laboratory, sealing themselves in with the female Darkseeker on which Neville has been experimenting . Discovering that the last treatment was successful, Neville tries to assess the situation as the alpha male deliberately rams himself against a glass door to break in . Neville draws a vial of blood from the woman he cured and gives it to Anna, before shutting her and Ethan inside a coal chute in the back of the lab . He then takes a grenade and kills the Darkseekers at the cost of his own life, saving the cure . The next day, before dusk, Anna and Ethan discover that her theory is right as they arrive at the survivors camp in Vermont . They are greeted by military officers and other human survivors before Anna is shown handing the cure to military personnel . </P> <P> During the lab attack, the alpha male makes a butterfly - shaped smear on the glass . Neville realizes that the alpha male is identifying the female which he was experimenting on by her butterfly tattoo and that it wants her back . Neville puts his gun down and returns the female . Neville and the alpha male stare each other down as the former apologizes to the latter . The alpha male accepts it and the Darkseekers leave . Shocked, Neville looks over the pictures of his numerous test subjects and the implications of his research methods begin to dawn on him . Neville, Anna, and Ethan then drive to the survivors' camp in Vermont with the antidote . </P> <Ul> <Li> Will Smith as Dr. Robert Neville: A former U.S. Army medical doctor and scientist before the worldwide plague, he loses his wife and daughter in a helicopter crash shortly after Manhattan is quarantined and spends the next three years trying to find a cure while defending himself against the Darkseekers . He is immune to the virus and uses vials of his blood to try to create a cure . </Li> <Li> Alice Braga as Anna Montez: A survivor from Brazil, she spent days harbored on a Red Cross ship in Philadelphia . After the city was overrun, she stayed with Ethan and several other survivors on the ship, but eventually, only Ethan and she survived since they were immune and the others were either infected or killed . She followed Neville's broadcasts to track him . </Li> <Li> Charlie Tahan as Ethan: A boy from Philadelphia, who spent time on the Red Cross ship with Anna and accompanied her when the ship was overrun . </Li> <Li> Dash Mihok as the Darkseekers' alpha male </Li> <Li> Emma Thompson as Dr. Alice Krippin: The doctor who creates the cancer cure, she inadvertently brings mankind to the brink of extinction; Neville dubs the virus "the Krippin virus". Her performance is uncredited . </Li> <Li> Salli Richardson as Zoe Neville, Robert's wife </Li> <Li> Willow Smith as Marley Neville, Robert's daughter </Li> <Li> Joanna Numata as Darkseekers' alpha female </Li> <Li> Darrell Foster as Mike </Li> <Li> Pat Fraley as voice of the President of the United States </Li> <Li> Mike Patton as voices of the Darkseekers </Li> </Ul> <Li> Will Smith as Dr. Robert Neville: A former U.S. Army medical doctor and scientist before the worldwide plague, he loses his wife and daughter in a helicopter crash shortly after Manhattan is quarantined and spends the next three years trying to find a cure while defending himself against the Darkseekers . He is immune to the virus and uses vials of his blood to try to create a cure . </Li>

Who played will smith's daughter in i am legend
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