RICHARD ALPERT FACES A DIFFICULT CHOICE, ON ABC'S "LOST"

"Ab Aeterno" - Richard Alpert faces a difficult choice, on "Lost," TUESDAY, MARCH 23 (9:00-10:06 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 Mark Pellegrino as Jacob, Titus Welliver as man in black, Mirelly Taylor as Isabella, Steven Elder as Jonas Whitfield, Juan Carlos Cantu as Father Suarez, Jose Yenque as doctor, Izzy Diaz as Ignacio, Davo Coria as servant, Santiago Montone as prisoner and Sonya Masinovsky as Russian nurse.

"Ab Aeterno" was written by Melinda Hsu Taylor & Greggory Nations and directed by Tucker Gates.

"Lost" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound. This program carries a TV-14,V parental guideline.

For more information on "Lost," visit ABC.com