Kate Hewlett

After working for countless hours on the Replicator coding Dr. McKay (David Hewlett) reluctantly admits that he needs help with the program. And the only available person who can match - or exceed - his knowledge is his sister Jeanie (Kate Hewlett). After working on the calculations from Earth Jeanie sends her results back to Atlantis and heads to bed. But the calm is broken when her bedroom is stormed by four men wielding MP-5's who tie up her husband and drag Jeanie into the night. When news reaches Atlantis that his sister is missing McKay travels to Earth racked by guilt for involving his sister. He is determined to find her and uncover who is behind the kidnapping. But when McKay also goes missing it's up to Lt. Col. Sheppard (Joe Flanigan) and Ronon (Jason Momoa) to figure out who has stolen the Replicator information... and the only two people who have the knowledge to understand it.

En route to check on a missing research team Lt. Col. Sheppard Dr. McKay Teyla and Ronan emerge from the stargate to find themselves swimming atop a flooded valley. With only the apex of the gate accessible above the waterline they cling to it - soaked and bitterly cold - until a puddle jumper can make it through to rescue them. But during the flight back to Atlantis McKay inexplicably falls ill and in the days that follow his condition declines further. Dr. Keller discovers a parasitic organism in his brain that cannot be surgically removed. As a result his ability to function continues to deteriorate to the point where he has virtually no recollection of who he is or what he is capable of. Soon his emotions and memories have regressed to those of a young boy and fearing that he will not pull through the doctor summons Jeannie McKay's sister to say her final goodbyes. But it's too late. Rodney no longer recognizes her or any of his friends. However Ronan has a plan albeit a very risky one. He tells Jeannie of a place - a shrine located on the planet Talus - that would grant Rodney one day to be himself again before he dies.

A 911 dispatcher does not believe a young girl who says an intruder has entered the house. Gun shots are fired and when the SRU's arrive, they find her mother shot and the girl abducted.