Kate Austen (Evangeline Lilly) and Jack Shephard (Matthew Fox)
THEY ARE: Kate is a former fugitive and part of a love quadrangle with Jack, a doctor and leader of the castaways, Juliet Burke and James "Sawyer" Ford. Kate and Jack are two of the Oceanic 6, the group that was rescued in January 2005 but lied about how they survived.
LAST SEEN: In 1977 attempting to erase their history on the island with a nuclear warhead.
Photo: Mario Perez/ABC
