Emilie de Ravin

Even before she landed the role of new mom Claire on Lost, de Ravin had appeared in several spooky, otherwordly projects, including the series BeastMaster, where she played a demon, and the TV remake of Carrie. But the Aussie actress' most prominent role was as Tess, the teenage alien vixen Roswell fans loved to hate. After she'd starred in the first two seasons (1999-2001) of the show's three-year run, fellow alien Max (Jason Behr, shown) impregnated her character, then abandoned her to fly off to a distant world and raise their sickly child on her own. Sound like any Flight 815 passengers you know?