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Rodney McKay is a Changeling: a human kidnapped by fairies and raised by them, in the Fae Realms, while a false duplicate (with a fiery expiration date of ten years) was raised by his parents. Exiled back in the Mortal world at age 14, he eventually comes to find a place at the SGC, inevitably becoming Head of Sciences of the Atlantis Expedition. There a great number of Fae and half Fae find a place, both in the civilian and military ranks, including his head engineer -a full blooded werewolf, the CMO -a 300 year old centaur, and the Military leader of the expedition, who is secretly a vampire.
Unexpected friendships and more are formed, as the expedition discovers the secrets of Atlantis and finds a way to survive and make allies in the distant Pegasus Galaxy.