It looks like Jack's father, Christian Shepard is back in the upcoming episode of Lost, "Namaste."
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Ben, Sun and Frank Lapidus go walking together on the Island in this scene from the upcoming episode of Lost, "Namaste."
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Jin and Sawyer walk alongside a captured Sayid in this scene from the upcoming episode of Lost, "Namaste."
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Jin talks on the microphone as he wears a Dharma jumpsuit with his name and the title of "Security" on it in this photo from the upcoming episode of Lost, "Namaste."
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The new recruits gather round in their jumpsuits and leis as they join Dharma in the upcoming episode of Lost, "Namaste."
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Well that's at least what the banner says above Sawyer, Kate, Hurley and Jack's head in the upcoming episode of Lost, "Namaste."
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Hurley, Kate and Jack are at the Dharma barracks in a very 1970s look in the scene from the upcoming episode of Lost, "Namaste."
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Sawyer looks all clean shaven and dons a pair of glasses in the upcoming episode of Lost, "Namaste."
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Lost Season 5 Episode 9 Quotes

[to Jin] Dude. Your English is awesome.

Hurley

Jack: John's dead.
Sawyer: Dead? How?