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Is Shannon's (Maggie Grace) life really placed in danger by a secret shared by her brother, Boone (Ian Somerhalder), and the enigmatic Locke (Terry O'Quinn) -- or is someone merely overreacting? Whatever the case, there are a few unsavory facts about the siblings' past relationship that come to light in this episode. Elsewhere, that apparently prehistoric island beast is due for a return "appearance." And while Hurley (Jorge Garcia) plans to repay Jin (Daniel Dae Kim) for past favors, Jin's wife, Sun (Yunjin Kim), accidentally reveals a secret while gardening with Kate (Evangeline Lilly).