Having been savagely bitten by the Wraith girl Ellia, Sheppard hurries back to Atlantis for medical treatment. Both he and Dr. Beckett are shocked, however, when they realize that the wound has vanished. Sheppard's arm is completely free of any trace of the bite.

While exploring a new planet, Sheppard, McKay, Teyla and Ronon are ambushed by a group of men armed with Wraith stunners. They awaken to find themselves prisoners in a cave, where they discover the mastermind behind the attack: Lt. Aiden Ford.