However, she passed on the energy to Dr. Jennifer Keller, giving her a very unpleasant nightmare. Ronon Dex thought that it was just a few isolated dreams, until he had one himself. They discovered it was the crystal, which took Sheppard as a negative presence in the nightmares. After the crystal was able to kill one of its victims, Dr. Kate Heightmeyer, they went back to M3X-387 to retrieve another crystal to learn from it, eventually finding a way to track the crystal with Atlantis's sensors. After its determined to be inside of Doctor Rodney McKay, he is isolated in a rubberized isolation room where a plan is come up with to use the Volsinii virtual reality technology to connect Sheppard into McKay's dreams to attempt to convince the entity to return to its crystal which is also hooked