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12 Episodes 2006 - 2006
Episode 1
Tue, Jul 18, 200685 mins
After a strange accident sidelines Eureka's sheriff, U.S. Marshal Jack Carter takes over the investigation into the mysterious phenomenon that led to the death of a resident.
Episode 2
Tue, Jul 25, 200643 mins
What appears to be a ghost begins terrorizing people and disrupting equipment shortly after a funeral, and even more surprising, one of the recently dead reappears alive.

Episode 3
Tue, Aug 1, 200644 mins
Jack shoots Henry after trying to arrest a mysterious man. Twenty-four hours earlier we meet Henry's two college friends who may be involved in Jack's memory loss. Everytime Jack and company come close to solving the case of what they forgot, their memory is wiped out again. Meanwhile, Jack must try to remember his daughter's play.
Episode 4
Tue, Aug 8, 200642 mins
The presence of a crop circle leads to thoughts of an alien invasion, the future of Eureka is threatened when a congressman visits, and Jo and Jack work on their trust issues.
Episode 5
Tue, Aug 15, 200644 mins
A lab accident causes a scientist to, seemingly, become indestructible, but Carter and Stark have their own concerns.
Episode 6
Tue, Aug 22, 200643 mins
After Fargo triggers a device from the Cold War era, the race is on to shut it off before it starts a world war, but the only solution may lie in the depths of a demented scientist's mind.
Episode 7
Tue, Aug 29, 200642 mins
A car accident leads back to scientists at Global, Zoe finds a boyfriend, and Jack tries to drum up support for a town baseball league.
Episode 8
Tue, Sep 5, 200644 mins
Odd fluctuations in computer-controlled environments may have something to do with the return of Eureka's prodigal son.
Episode 9
Tue, Sep 12, 200641 mins
Taggart achieves a medical breakthrough while Fargo invents a device that bridges the divide between computers and human brains.
Episode 10
Tue, Sep 19, 200644 mins
Strange behavior exhibited by the townspeople is investigated by Carter, who has to solve the mystery before Stark makes a decision that could affect the world.
Episode 11
Tue, Sep 26, 200644 mins
When Stark stops Carter from investigating a crime, again, he decides to play hooky. When he contemplates getting away from Eureka, S.A.R.A.H., his house decides to make sure he doesn't and even lures Stark, Allison, Henry, Fargo, and Beverly and keeps them there. When they try to deactivate S.A.R.A.H. another A.I. program comes out and declares everyone there as hostiles.
Episode 12
Tue, Oct 3, 200644 mins
After another lab accident Jack wakens to a whole new world.