Enough is at stake that the need to resolve the unanswered questions is matched by the drama building in the fate of the characters. Fans still want to know what created the destructive black smoke monster (unseen this season), but more importantly will there ever be release for the likes of Sayid (Naveen Andrews), a character of such grim resoluteness? How bonkers can survivor faction leader Locke (Terry O'Quinn) get?
The greatest transformation, however, is happening with the nominal villain, Ben Linus (Michael Emerson). Lonely child, patricidal killer, manipulator and instigator of abduction and mass murder, he's slowly evolving into the most important character on Lost. He creates confusion within confusion, but it's increasingly unclear whether he's a true believer or a malignant force.
It's an immense performance by Emerson, full of unexpected nuance. "We're the good guys," Ben insisted at the end of season two and on a show where little is left to chance, that may actually be true. If Lost can make us truly care about this meek-looking monster, then that will be the greatest of all its achievements.