- Played by Tania Raymonde.
- Daughter of Danielle Rousseau
- Danielle called her Alex, short for "Alexandra".
- Alex was taken from Danielle by the Others when she was a week old.
- During the confrontation between the Others and the search party that Jack assembles to find Michael, Mr Friendly calls out, "Bring her out, Alex." An unseen adult figure brings out a bound and hooded Kate.
- Helped Claire escape from the Medical Station where she was kept by Ethan and the Others.
Theories
- Some say there is a striking similarity between Alexandra and the girl in a photograph which appears on the Hanso Foundation website within the "Television Ad" section. The image is displayed through a flash presentation on the bottom right of the screen and she is wearing a green shirt. A doctor [is that a labcoat he's wearing?] and another apparent male teenger are also seen.
The picture is labeled as representing the Institute for Genomic Advancement.
- Actually going to the Institute's website will provide a much clearer image of the photo.