Here's the synopsis for Ep 5.01 "Because You Left" (Season premiere)
Airdate: January 21, 2009 at 9 p.m.
The remaining island survivors start to feel the effects of the aftermath of moving the island, and Jack and Ben begin their quest to reunite the Oceanic 6 in order to return to the island with Locke's body in an attempt to save their former fellow castaways. Guest cast: L. Scott Caldwell as Rose, Sam Anderson as Bernard, Nestor Carbonell as Richard Alpert, William Mapother as Ethan Rom, Francois Chau as Dr. Marvin Candle,Sonya Walger as Penelope "Penny" Widmore, Alan Dale as Charles Widmore, Rebecca Mader as Charlotte Lewis, William Blanchett as Aaron, Sean Whalen as Neil Frogurt, Tom Irwin as Dan Norton, Michael Dempsey as foreman, Stephanie Smart as ticket agent, Leslie Ishii as woman, Cindy Paliracio as TV anchor, Brad Berryhill as anxious guy, Sven Lindstrom as crew member, Chantal Boomla as counter girl, Jeremy Colvin as security guard. Source: ABC
Here's the ABC synopsis for Ep. 5.02 "The Lie"
Airdate: January 21, 2009 at 10 p.m.
Hurley and Sayid are on the run from the cops after stumbling into trouble at the safehouse; the island survivors come under attack by unknown forces; and an old friend offers some shocking advice to Kate in order to ensure that "the lie" remain a secret. Guest cast: Michelle Rodriguez as Ana Lucia, L. Scott Caldwell as Rose, Sam Anderson as Bernard, Sonya Walger as Penelope "Penny" Widmore, Rebecca Mader as Charlotte Lewis, Jeff Fahey as Frank Lapidus, Lillian Hurst as Carmen Reyes, Cheech Marin as David Reyes, William Blanchett as Aaron, Sean Whalen as Neil Frogurt, Tom Connolly as Jones, Mary Mara as Jill, Dana Sorman as Darlene, James Jeremiah as police officer, Stephanie Conching as nurse, Matthew Allan as Cunningham, Todd Bryant as Mattingly. Source: ABC