The battle with Ichigo and Amagai comes to a close. Amagai finds out the shocking truth of his father's death.

Atlantis joins forces with a Wraith faction led by Michael, the Wraith they tried to turn into a human, who seeks their help in destroying their common enemies.

While in LA, Alan takes on the case of TV star Courtney Reese, who is arrested after shooting a photographer who she mistakes for a stalker. But Denny and Barry make life difficult when they won't stop making sexual advances toward their client. Meanwhile, Denise resorts to underhanded tactics to eliminate Marlene from the picture, but the plan backfires when she is caught by Paul. And Brad enlists Shirley's help in trying to persuade the judge in his niece's trial to lower the sentence.

Following an experiment on the artifact, Eureka warps to 2010. However, temporal anomalies begin to cause problems for Eureka, which leads to a shocking revelation.

In the season finale, all three couples, Tom and Trina, Roger and Janet and Bruce and Susan, face decisions about their respective marriages as they attend the Deckers's end of summer clambake party.