The final season of LOST starts tomorrow.
Jacob & the Smoke Monster - have been around for centuries. The Island does not let women bear children - the babies & the mothers die. Jacob & the Smoke Monster are somehow feeding off them.
Related: Aaron & Walt are coming back to the island. Jacob & the Smoke Monster need their bodies to continue on.
Richard Alpert - has not aged in at least 100 years. Was he carried to the island on the Black Rock slave ship?