Series finale, Conclusion. The Locke monster continues his quest to escape the island---and destroy it---but Jack is equally determined to protect the island's light. Both need help from Desmond. In L.A., Desmond reconnects long-lost Losties and steers them toward an emotional reunion with Jack; Also on this episode of Lost - Cat Lawyer, Pinky Promise, Rap name, Sing Praise, Tell Me a Lie, Mind Blowers.