LOST: It only ends once...

...Anything that happens before that is just progress. (Or so sayeth Jacob.)

And so it's finally Groundhog Day, aka "The Beginning of the End." Tonight at 7 Central, ABC will air "The Final Chapter," a recap hour -- followed at 8 by "LA X," the two-hour premiere of Lost's sixth and final season.

Check in here and join in our discussion after the show, and follow LostiesIsland on Twitter for more tidbits.

While you're waiting for tonight's magic hours to begin, read how the Washington Post's Jen Chaney and Liz Kelly contemplate the end of Lost days over on their "Lost Central" blog.

Think, too, about what "LA X" might mean. Sure, it's air-traffic code meaning Los Angeles International Airport, the destination of Oceanic 815.

But what of that space between the A and the X? It's no accident, that space.

If you asked Daniel Faraday what X means, he would say it represents an unknown variable. Perhaps that's what the X in this "LA X" stands for: the unknown. The X factor. The mystery.

For five years, Lost has been our favorite pop-culture conundrum. We've all loved being trapped on Mystery Island, even when it felt as if our heads might explode.

For five years, we've had questions. This year, it is promised, we'll get answers.

But we still have 18 hours of storytelling to go. And until those 18 hours are over, we're on board with what Jen and Liz say: It's about relishing the journey, instead of the destination.