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21 Episodes 2010 - 2011
Episode 1
Fri, Jul 9, 201044 mins
During the Founders' Day celebration, Jack, Allison, Fargo, Henry, and Jo somehow end up in 1947, in the middle of the army base that existed before Eureka was founded. They must find a way home before they change history or get caught.

Episode 2
Fri, Jul 16, 201044 mins
The gang returns from 1947 and discover that things are not as they remember them. And Dr. Grant came along.
Episode 3
Fri, Jul 23, 201044 mins
Wil Wheaton guest stars as Dr. Isaac Parrish, an underappreciated scientist whose hostility appears to have gone viral. Blind rage is infecting everyone at Global Dynamics with potentially catastrophic results -- especially for Fargo.

Episode 4
Fri, Jul 30, 201044 mins
Allison deals with a major problem during Eureka's space week festival.

Episode 5
Fri, Aug 6, 201044 mins
Claudia Donovan pays a visit to Eureka, hoping to see some amazing technological wonders. She gets more than she bargained for when seemingly random objects begin appearing around town. Working with Sheriff Carter and Fargo, Claudia has to help solve the mystery before the strange anomalies have deadly consequences...particularly for newcomer Dr. Grant.

Episode 6
Fri, Aug 13, 201044 mins
Allison accepts Carter's offer to include Kevin in a camping trip for some guy time, and Henry decides to level with Grace while a very peculiar -- and dangerous -- relationship threatens Eureka and the not-so-happy campers.
Episode 7
Fri, Aug 20, 201044 mins
Romantic relationships are in flux. Zoe is home for a visit and hints at a new heartthrob. Henry is courting his wife while Dr. Grant and Carter spar over Allison. Jo, on the other hand, is done with love for now and just wants to get her house rebuilt. But that project is on hold because hunky paleo-anthropologist Dr. Derek Thurgood says he found ancient human remains at the site and refuses to allow the build to continue.

Episode 8
Fri, Aug 27, 201044 mins
As Grace (Tembi Locke) finds a way to share her memories with Henry (Joe Morton), the rest of Eureka's citizens face the return of people from the recent - or not so recent - past.

Episode 9
Fri, Sep 10, 201044 mins
Mid-Season Finale! Closer than they've ever been before, Allison (Salli Richardson-Whitfield) and Carter (Colin Ferguson) join forces personally as well as professionally when Jo (Erica Cerra) and Fargo (Neil Grayston) enlist them to help find a stolen Global Dynamics project.

Episode 10
Tue, Dec 7, 201044 mins
Sheriff Carter relates a Christmas story in which the defensive field malfunctions trapping everyone in town for the holiday. So Fargo throws a big party, unaware that the town is shrinking. All from a quest for the perfect fruitcake.

Episode 11
Mon, Jul 11, 201144 mins
Carter lands in an awkward situation after S.A.R.A.H. and Andy's nuptials hit a snag; Zane keeps harassing Jo for details; an unscheduled launch presents trouble for the gang.
Episode 12
Mon, Jul 18, 201144 mins
When Eurekans start behaving oddly, Carter scours the town for a cause - never suspecting that Allison, miles from home, is the one facing real danger.
Episode 13
Mon, Jul 25, 201144 mins
Carter and Jo try out Zane's new high-powered risk assessment system, but find that even it may not be a match for the dangerous level of competition among Eureka's scientists.

Episode 14
Mon, Aug 1, 201144 mins
Carter must solve an only-in-Eureka bank robbery before the town floats away, while Allison deals with unsettling episodes of lost time.
Episode 15
Mon, Aug 8, 201144 mins
The predicted danger posed by Allison materializes when she is subjected to mind control to steal Eureka's secrets.

Episode 16
Mon, Aug 15, 201144 mins
When the microbots assembling the Titan spacecraft finish their task they opt to take on a new project and proceed to devour Eureka in the process. In isolation for a mission evaluation, the Titan team can't tell if the microbot catastrophe is real or just part of the test.
Episode 17
Mon, Aug 22, 201143 mins
Preparations for the Titan mission have the unintended consequence of turning the local Eureka environment into Titan's. Meanwhile, Eureka couples struggle to come to terms with each other and the DoD sends an investigator to evaluate Jack and Allison's relationship.
Episode 18
Mon, Aug 29, 201144 mins
As the Astraeus candidates undergo final interviews, Carter and Allison appeal the results of their relationship audit while trying to keep a lid on escalating mishaps around town.

Episode 19
Mon, Sep 12, 201144 mins
Grace embraces an honor that strains her relationship with Henry while Deputy Andy becomes an accidental guinea pig for the Astraeus mission -- with catastrophic results.

Episode 20
Mon, Sep 19, 201144 mins
Hours before the launch of the Titan mission Eureka struggles with black holes and, having decided who will stay and who will go, goodbyes.

Episode 21
Tue, Dec 6, 201144 mins
In Eureka's "Do You See What I See," the quaint town of geniuses is transformed into animated versions of themselves. Sheriff Carter (Colin Ferguson) and Allison Blake (Salli Richardson-Whitfield) are secretly planning the perfect holiday surprise for their kids, but a mysterious kaleidoscopic wave of color crashes over Eureka, leaving the entire town and its inhabitants animated. Leading production and entertainment company Curious Pictures will produce the animation featured in the episode, which will be broken up into different styles including Anime, claymation, animation inspired by the Looney Tunes cartoons and modern cg.