It had seemed like the writers had backed themselves into a corner. Still so many unanswered questions lying in the past, but they had largely moved away from heavy exposition and the flashback device. Their answer was brilliant: to make some of the characters live their way through these missing pieces of the puzzle.
Time travel is an element that has been progressively introduced since Desmond's 'flashes' in season three, through to dislodged consciousness in season four, and now to physical displacement in season five. Those that have said it's been introduced out of the blue simply haven't been paying attention: it's been on the cards for a while, and neatly solves the narrative puzzle facing the writers.
The acting is to the usual high standard with some standout performances from Terry O'Quinn and Michael Emerson. The plot twists and turns, but the constant revival and resolution of previous elements (some stretching back to the first series) reassures the viewer that this rollercoaster has a sense of direction. Excellent use of sound helps cement a solid experience, and whilst the music offers nothing revolutionary, it's recurring melodies help tie the new elements back to existing themes with familiar musical cues and motifs.
What of the story itself? Characters previously mentioned only in name are now fleshed out to a satisfying level (most notably Jacob and Radzinsky). Furthermore, we begin to properly grasp the nature of the Dharma Initiative, see Ben have a chilling encounter with the monster, and watch the writers move all the pieces into place for the final series. Overall, this is gripping stuff. Just one word to the wise: the ending is perhaps the most ambiguous cliffhanger in television history (it's well executed, but it'll have you racking your brains for the next 8 months).
The episodes have been fantastic, but the one thing I can't make a comment on this early are DVD extras. This is well worth your money, and a must-buy for any fans of the mythology.
Roll on season six, and to quote Charles Widmore: 'there is a war coming'.