After playing Rita's crazy, drug-addicted ex on Dexter, Mark Pellegrino will be joining the cast of Lost on the season five finale later this year in a pivotal role.  So just what can we expect from Pellegrino's character?

According to speculation by Ausiello Files, Pellegrino will be playing Jacob in an off-island, 1970s flashback involving some familiar faces.  One of those familiar faces is *a****.  Yeah, we love Ausiello's asterisks just as much as you.

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