pparently able to reprogram their base code, the Replicators have attacked and defeated the Ancients who had only recently taken over control of the city. General O'Neil and Richard Woolsey had stayed behind to negotiate with the Ancients and are hiding out in a remote part of the city. It doesn't really matter however since O'Neil's standing orders are that Atlantis is to be destroyed with a nuclear device should it ever be taken over by hostile forces. Sheppard, Weir, McKay and Beckett collect Teyla and Ronon Dex en route and devise a plan to surreptitiously enter the city and rescue their colleagues. If they are to be successful McKay will also have to find a way to destroy the Replicators before they reprogram themselves and make their weapons useless.

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