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In a dark mirror universe of our own, sixteen year old Rodney McKay is brought to Atlantis by the Chief Science Officer, his older sister Jeannie, after their parents die. While Jeannie has no real use for Rodney, Colonel Sheppard does. Now Rodney has to come to terms with the fact that not only is he Sheppard's boy toy, but also that Sheppard is a moody, paranoid sadist.
For his part, John isn't quite sure what to make of Rodney, who is an almost too perfect match for him. Just as he and Rodney carefully start to settle into a complicated relationship, a conspiracy begins to surface, forcing Rodney to take a stand.
- Part 1 of The Devil You Know