In the series finale, the Department of Defense's closure of Eureka is delayed by random wormhole materializations.
The doubles steadily take over GD, which means Fargo, Allison and Zane are in a fight for their lives and everyone else's as they try to avoid capture and fix the problem.
The Department of Justice arrives to investigate Grace, and Henry struggles with his conscience. Holly receives a message that triggers a chain of events. The question is whether it's her actions or Fargo's malfunctioning signature achievement that are causing the scary incidents all over GD and the town.moreless
Carter and Allison's perfect honeymoon is interrupted when sabotage is discovered in Eureka. Elsewhere, Holly faces another hurdle to remain intact.
While under the influence of a smart drug, Carter becomes a genius like everyone else in town and starts to change the laws of physics. Unfortunately, his condition soon endangers all of Eureka, including Allison's brother who is in town just to meet his new brother-in-law.moreless
Carter and Allison's romantic plans run afoul of a rogue submarine, and it's up to Jo to save their lives … if she can fix the mess at Global Dynamics caused by an out-of-control prankster in time.moreless
The Department of Defense insists on installing new security and removing all Astraeus artifacts, but Fargo resists because he believes Holly is alive in the matrix. Elsewhere, Henry recruits Carter for a brain experiment.moreless
When the ship with the Astraeus crew returns to earth, its occupants discover that four years have elapsed and time isn't the only thing that has changed.
As Carter and Blake prepare a Christmas surprise for the kids, a wave of energy sweeps over Eureka, transforming everyone into animated characters.
The Astraeus participants make their farewells to their earthbound family and friends. Elsewhere, Carter and Jo investigate the person—or thing—which attacked the presidential convoy and if it is in any way related to the cosmic anomalies threatening Eureka.moreless
When an explosion in the Astraeus lab accidentally sends Andy to Titan, the team must devise a plan to save him before it's too late.
Attacks in town may scuttle the Astraeus mission in the same week the final 20 will be named. Carter and Allison appeal the auditor's recommendation, but the proposed fix, a memory-reading gadget for the candidates' final interviews, may give them more details about each other than desired.moreless
Tiny makes an explosive reentry on the same day the Department of Defense demonstrates how little control Allison and Carter have over their personal lives by sending an auditor whose task it is to analyze their relationship. Elsewhere, Jo turns herself into a wedding planner extraordinaire for a reluctant Grace and Henry as Zane prolongs his departure, and Fargo must decide how he wants his relationship with Holly to progress. But none of it matters when it appears the gases Tiny brought back may be be the end of Eureka.moreless
Carter can't get into the Christmas spirit especially with the town surrounded by a force-field. Fargo organizes the GD holiday party, and Allison is full of holiday cheer.
Tess' reign as head of Global Dynamics may be shorter than planned after she receives an offer from Australia. Elsewhere, the town deals with a magnetic disturbance and Carter must come to terms with Zoe leaving for college.moreless