The Astraeus crew returns to Eureka four years later and must adapt to a myriad of changes, including a more oppressive version of Deputy Andy, in the Season 5 premiere.
Beverly Barlowe resurfaces in Eureka seeking Carter's help to free the Astraeus crew, and the rescue plan lands Carter in the crew's virtual world.
The Astraeus crew tries to overcome their Matrix Eureka experience. Meanwhile, Fargo struggles with Holly's death and old animosities erupt as Parrish's latest project threatens to ignite the town.
The crew moves forward after an ordeal and Warren's visit adds to the pressure.
Henry conducts a preparedness drill that winds up a disaster and Fargo faces a hard reality.
Fargo is convinced that Holly is still inside the Matrix computer, but the DOD is determined to wipe the hard drive clean-losing Dr. Marten forever.
A malfunctioning experiment cuts Eureka off from the world and threatens to destroy all human life in town unless Carter can figure out who sabotaged the experiment and stop them before it's too late.
The people of Eureka are being kidnapped and replaced by body-doubles one by one unless Allison, Fargo and Zane can figure out how to avoid capture and save their town.
Wormholes randomly materialize around Eureka as the Department of Defense is set to shut the town down in the series finale.