The Variable is the fourteenth episode of the fifth season of Lost, and the one-hundredth episode overall.
The time of reckoning has begun when Daniel Faraday comes clean regarding what he knows about the island.
Starring: Naveen Andrews (Sayid), Henry Ian Cusick (Desmond), Jeremy Davies (Daniel Faraday), Michael Emerson (Ben), Matthew Fox (Jack), Jorge Garcia (Hurley), Josh Holloway (Sawyer), Daniel Dae Kim (Jin), Yunjin Kim (Sun), Ken Leung (Miles Straume), Evangeline Lilly (Kate), Elizabeth Mitchell (Juliet), Terry O'Quinn (Locke).
Guest Starring: Nestor Carbonell (Richard Alpert), Alan Dale (Charles Widmore), Alice Evans (Younger Eloise Hawking), Sarah Farooqui (Theresa Spencer), Patrick Fischler (Phil), Fionnula Flanagan (Eloise Hawking), Eric Lange (Radzinsky), Sonya Walger (Penelope Widmore).
Co-Starring: Spencer Allyn (Young Daniel Faraday), Brad Berryhill (Anxious guy), Todd Coolidge (Paramedic), Marvin DeFreitas (Charlie Hume), Michael Dempsey (Foreman), Ariston Green (Workman), Maya Henssens (Young girl), Wendy Pearson (E.R. doctor), Peggy Anne Siegmund (Caretaker), Jennifer Sojot (E.R. nurse).