A month has passed and the town continues searching for the missing Astraeus crew after the DOD calls off the search.
Carter and Andy go on a mission to retrieve the last part Kevin needs for a scanner to locate the Astraeus.
As the Astraeus crew tries to overcome their Matrix Eureka experience, Fargo struggles with Holly's death and decides to take an experimental therapy patch to accelerate his progress through the five stages of grief.
The Astraeus crew returns to Earth to discover that they have been missing for four years and, in their absence, Eureka has moved on without them.
SARAH is the head of Global Dynamics with an army of Andy replicas as her security force.
Zane restarts the Computer Matrix Mainframe that created the virtual Eureka in the hopes of recovering some of the corrupted data.
The Mainframe begins to search for the people that were plunged into it during Senator Wen's neural experiment.
Henry pulls a stun grenade on everyone but Beverly, including himself, trusting Beverly with Carter's life.
Beverly gets Zane to log her back on and ejects Carter, she then kidnaps senator Wen and plugs her into the simulator, trapping her in a looping virtual version of the Sheriff's office.
The fifth season of Eureka premiered on April 16, 2012 on the cable network Syfy in the United States.
On August 17, 2010, Syfy announced that there will be a fifth season.
After being apprehended, they are rescued by Jo when she returns from her walkabout and Carter realizes that the crew hasn't been lost in space, but on Earth.
Kevin and Henry locate the Astraeus and Carter and Jo lead a rescue team.
Now reunited, Jack and Allison work with the others to overthrow SARAH and Andy's oppressive regime and restore balance to the town.