Juliet Burke

Juliet Burke turns up in Lost's third season looking impossibly ordinary — hosting a book club, baking bread — before the show reveals she's an Other, embedded among Ben's people on the island. A fertility doctor, she's clinical, watchful, and hard to read: is she a captor, a prisoner, or something in between?

The writing withholds her loyalties for as long as it can stand to, and Elizabeth Mitchell makes the ambiguity feel lived-in rather than gimmicky — her stillness reads as competence one scene and grief the next. She arrives fully formed, giving Lost a character whose allegiance you have to earn the truth about, not just wait for a twist to hand you.