 Danielle Rousseau is a fictional character on the ABC drama television series Lost , which chronicles the lives of over forty people after their plane crashes on a remote island somewhere in the South Pacific . Croatian actress Mira Furlan plays the scientist who shipwrecks on the island sixteen years prior to the crash of Oceanic Flight 815 . After Rousseau is killed in the fourth season , the American actress Melissa Farman portrayed a younger version of the character in the fifth season . Furlan later reappears for one episode in the sixth season . Rousseau is a recurring on @-@ island character who has appeared in nineteen episodes in seasons one through four , as well as one episode where her voice alone is heard , and her final episode in the sixth season . 
