Well, this is it, folks, the last episode of LOST before the two and a half hour finale on May 23.  Below we have a promo, a sneak peek and a synopsis for the May 18 new episode of LOST.  The synopsis guest list is extremely spoilery, assuming that you don't want to know who might be returning.

LOCKE DEVISES A NEW STRATEGY, AND JACK'S GROUP SEARCHES FOR DESMOND, ON ABC'S "LOST"

"What They Died For" - While Locke devises a new strategy, Jack's group searches for Desmond, on "Lost," TUESDAY, MAY 18 (9:00-10:02 p.m., ET) on the ABC Television Network.

"Lost" stars Naveen Andrews as Sayid, Nestor Carbonell as Richard Alpert, Emilie de Ravin as Claire, Michael Emerson as Ben, Jeff Fahey as Frank Lapidus, Matthew Fox as Jack, Jorge Garcia as Hurley, Josh Holloway as Sawyer, Daniel Dae Kim as Jin, Yunjin Kim as Sun, Ken Leung as Miles, Evangeline Lilly as Kate, Terry O'Quinn as Locke and Zuleikha Robinson as Ilana.

Guest starring are Henry Ian Cusick as Desmond, Michelle Rodriguez as Ana Lucia, Mira Furlan as Danielle Rousseau, Alan Dale as Charles Widmore, Tania Raymonde as Alex, Mark Pellegrino as Jacob, Dylan Minnette as David, Sheila Kelley as Zoe, Kenton Duty as teenage boy, Wendy Pearson as Nurse Kondracki, Ashlee Kyker as student and Ernesto Lopez as LAPD cop.