For me, this is without a doubt the most significant episode since the Pilot episode that started it all off. This is what you call a whopper of an episode. First, we get to see Ben being born and how he came to the Island. Second, we see him meeting an ageless Richard Alpert who is a 'Hostile'. Third we see the 'Purge' that's been mentioned a few times before. Fourth, we see that Ben killed his own father, Roger 'Workman', the same guy that is found in Hurley's van. Fifth, Ben shoots and supposedly kills John Locke. Tell me that isn't an episode you don't wanna watch? Oh, and one other thing, this was also the first "appearance" of Jacob.

Also, Sayid and Sawyer confront Juliet about the tape recording and we learn that Jack already knows what her and Ben's plans are regarding the pregnant women of the camp. Awesome episode.