While Locke devises a new strategy, Jack's group searches for Desmond. 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. Written by Edward Kitsis & Adam Horowitz & Elizabeth Sarnoff and directed by Paul Edwards.Don’t forget: the 2.5-hour finale airs this Sunday, not next Tuesday. 9 p.m. Tuesday. ABC. 9 p.m. Sunday. ABC.