Ep 24. Live Together, Die Alone (2)

After discovering an electromagnetic anomaly on the island, Desmond enlists the help of Locke to fix a computer program that will allow him to contact the outside world. Meanwhile, Jack leads a group to confront the Others and rescue Walt, while Sawyer and Kate attempt to escape from the island. The episode features flashbacks of Desmond's life prior to crashing on the island, including his relationship with his girlfriend Penny and his time in the military. As tensions rise and alliances shift, the survivors are forced to make difficult and fateful decisions in order to survive.