Prepping for tonight's episode

What do you need to know before you watch the fourth episode?

Here's help from Doc Jensen for tonight's Locke-centric episode.

I can't help but wonder if Locke's backstory will remain the same. Will he be born premature to a teenage mother? Will his father throw him out a window? Will he be the man of faith off the island?

If the bomb going off can make Sayid Iranian (if he really is) instead of Iraqi ... Shannon not get on the plane ... Jin and Sun not married ... and get rid of Hurley's bad luck ... What will it change for Locke?

The article is spoiler free.

But here's a peak at tonight's episode. It's less than a minute.