Reply #22: I'd be willing to speculate that Desmond's wife use to be [View All]

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involved in Dharma in some way and that there was an "event" that caused a rift in the group, she was outcasted and Benjamin took control. At the end of season 2 we see her being notified that they've found Desmond. But they found Desmond because they were looking for a some type of geomagnetic signal. Which I think means that she knows about the island/dharma, probably lived there, but is unable to return because she doesn't know where it is.

I would further speculate that Desmond's wife is actually related to Benjamin by blood. Call it a hunch.

As far as Walter, I don't think he had any connection to the island prior to the crash. I think he's just a wild card that writers introduced. I agree with you that he'll end up being a key piece of the puzzle.