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eyla is shocked when she sees the ghostly image of a woman in the corridors of Atlantis. The woman is an Ancient in appearance but, initially at least, no one else can see her. Others begin to have their own visions however. Dr. McKay is enjoying himself watching a whale-like creature that is swimming just off the city. He's certain that it's the same creature who guided Sheppard to save him when he was trapped on the ocean floor. He nicknames the creature Sam, after his good friend Samantha Carter. When hundreds of the sea creatures are found to be heading for Atlantis, clearly something is wrong. McKay's search of the alien database reveals that Atlantis is under threat of destruction.

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