At the end of season 1, Jack saw the Doctor. The corresponding episodes you need to see on Doctor Who (to see what happened) are in season 3 of that show. Utopia, followed by The Sound of Drums, and then The Last of the Time Lords.
Then, watch season 2. At the end of that, go to season 4 of Doctor Who, for Journey's End--Jack, Ianto, and Gwen help out for that. (Part 1 of Journey's End is The Stolen Earth--watch that one, too)
ETA: The icon I'm using for this comment shows something Jack did in Utopia.
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timeasmymeasure
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Date: 2008-12-06 08:17 pm (UTC)Then, watch season 2. At the end of that, go to season 4 of Doctor Who, for Journey's End--Jack, Ianto, and Gwen help out for that. (Part 1 of Journey's End is The Stolen Earth--watch that one, too)
ETA: The icon I'm using for this comment shows something Jack did in Utopia.