The season 3 finale finds the castaways preparing for an invasion by the slightly less mysterious Others, while Charlie and Desmond find more than they were looking for in the underwater "Looking Glass Hatch".
Quest roles:
Nestor Carbonell(Richard Alpert), Malcolm David Kelley(Walt Dawson), L. Scott Caldwell(Rose Nadler), Mira Furlan(Danielle Rousseau), Julie Bowen(Sarah Wagner), M.C. Gainey(Tom Friendly), Sam Anderson(Bernard Nadler), Tania Raymonde(Alex Rousseau), Sonya Walger(Penelope Hume), Blake Bashoff, Andrew Divoff, Brian Goodman(Ryan Pryce), Marsha Thomason(Naomi Dorrit), Lana Parrilla, Tracy Middendorf, James Lesure