The city of Atlantis becomes host to the minds of disembodied Replicators, led by someone very close to the team.

The town’s annual dog show gets into full swing complete with exploding robotic canines. Meanwhile, Sheriff Carter experiences an isolated earthquake, Zoe contemplates quitting the accelerated physics program, and Allison starts fitting her wedding dress.

Sheriff Carter and Allison investigate the disappearance of a scientist from a sealed biosphere. Meanwhile, “The Fixer” attempts to make Eureka’s ventures more profitable.

The team boards the Daedalus when it shows up abandoned in orbit, only to find themselves skipping through parallel universes.

Eureka is threatened by an intelligent drone with “issues” after an anti-missile test. Meanwhile, Eva Thorne, nicknamed “The Fixer” after dismantling and rebuilding several corporations, arrives in Eureka to evaluate Global Dynamics’ expenditures.

Ba’al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.

Ronon once again comes face-to-face with Tyre, one of his people who became a Wraith worshiper — but who now claims he has broken free of their influence.

When an alien organism incapacitates Dr. Keller, the team seeks help from an old friend recently revived from stasis.

After a conflict with Michael leaves several Atlantis personnel trapped, Colonel Carter leads a rescue mission.

D’Anna holds President Roslin and other Colonials hostage in order to draw out the Final Five from the Colonial fleet. Col. Tigh believes he has the solution to end the standoff.