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Season 4
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Season 3 Season 5

The fourth season of Eureka premiered on July 9, 2010 on the cable network Syfy in the United States and concluded on September 19, 2011, with a Christmas special on December 6, 2011.

Broadcasted episodes[]

Image Title Writer(s) Director(s) Airdate #
Founder's Day Founder's Day Writer: Jaime Paglia Director: Matthew Hastings July 9, 2010 #401
During the Founder's Day celebration, Carter, 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.
A New World A New World Writer: Bruce Miller Director: Michael Robison July 16, 2010 #402
When the five time travelers, Carter, Allison, Fargo, Henry, and Jo, return from 1947, they discover that things are not how they were when they left. To their shock, they discover that that Dr. Grant hitched along the ride back with them.
All the Rage All the Rage Writer: Kira Snyder Director: Mike Rohl July 23, 2010 #403
Tess is moving in with Carter, but Carter is less than excited about it. Dr. Isaac Parrish, an underappreciated scientist, hostility towards Fargo appears to have gone viral. Now blind rage is infecting everyone at Global Dynamics with potentially catastrophic results -- especially for Fargo. When Deacon and Grant try to work on the Einstein-Rosen Bridge, odd things start to happen, which may be a result of their forbidden time travel trip.
The Story of O2 The Story of O2 Writer: Eric Tuchman (teleplay) & Jill Blotevogel (story) Director: Colin Ferguson July 30, 2010 #404
The annual race around the moon sees Kevin take an early lead, but is he cheating? Meanwhile, Jack visits Harvard, worried about what might have changed with Zoe because of his time travel trip.
Crossing Over Crossing Over Writer: Paula Yoo Director: Michael Robison August 6, 2010 #405
Claudia Donovan visits Eureka as a V.I.P., 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.
Momstrosity Momstrosity Writer: Terri Hughes Burton & Ron Milbauer Director: Mike Rohl August 13, 2010 #406
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.
Stoned Stoned Writer: Eric Wallace Director: Joe Morton August 20, 2010 #407
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 paleo-anthropologist Dr. Derek Thurgood says he found ancient human remains at the site and refuses to allow the build to continue.
The Ex-Files The Ex-Files Writer: Amy Berg Director: Chris Fisher August 27, 2010 #408
As Grace finds a way to share her memories with Henry, the rest of Eureka's citizens face the return of people from the recent - or not so recent - past.
I'll Be Seeing You I'll Be Seeing You Writer: Jaime Paglia Director: Michael Robison September 10, 2010 #409
Closer than they've ever been before, Allison and Carter join forces personally as well as professionally when Jo and Fargo enlist them to help find the D.E.D., a stolen Global Dynamics weapon. When Carter and Grant become stranded in 1947 again, they must race back in time to save Eureka... and Allison.
O Little Town... O Little Town... Writer: Eric Tuchman Director: Matthew Hastings December 7, 2010 #410
(Despite the fact that this is a holiday special, it does take place in the normal timeline) When some of Eureka's children are unhappy that a heavy snowfall has cancelled their holiday travel plans, Sheriff Carter tells them about another wonderful Christmas when he was stranded in town and learned to appreciate everything around him.
Liftoff Liftoff Writer: Bruce Miller & Jaime Paglia (Story)
Bruce Miller (Teleplay)
Director: Mike Rohl July 11, 2011 #411
An accident in the lab results lead to Fargo and Zane Donovan being fired into space in a sixty-year-old rocket with no telemetry or re-entry capability. Meanwhile, ANDY is having relationship trouble with SARAH.
Reprise Reprise Writer: Amy Berg Director: Matthew Hastings July 18, 2011 #412
Carter's duties expand to babysitting Allison's kids after Allison leaves town for a medical conference. 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. Meanwhile, a new rocket scientist appears at Café Diem.
Glimpse Glimpse Writer: Ed Fowler Director: Michael Robison July 25, 2011 #413
Scientists compete to be on the Astraeus mission crew for the trip to Titan. Carter and Jo try out Zane's new high-powered risk assessment system... contact lenses that predict potential security breaches. However, they find that even it may not be a match for the dangerous level of competition among Eureka's scientists.
Up in the Air Up in the Air Writer: Kira Snyder Director: Alexandra LaRoche August 1, 2011 #414
Carter has to investigate a Eureka-style bank robbery. Meanwhile, the selection process for the Astraeus mission goes into the next stage. Allison's behavior becomes increasingly erratic, and she experiences major gaps in her memory.
Omega Girls Omega Girls Writer: Eric Wallace & Jaime Paglia Director: Salli Richardson-Whitfield August 8, 2011 #415
Now the newly appointed head of GD while Fargo is attempting to join the mission, too many aberrations in Allison's behavior leads Carter to suspect that something is wrong. With the help of Zane Donovan and Henry Deacon, they hack Allison's medical records, and find out that someone is controlling her using nanotechnology. When confronted, Beverly triggers a town-wide coma and moves her plan into the next phase. Zoe – visiting the town for the weekend – and Jo, who goes to collect her, are unaffected. Only they have any chance to stop Beverly now.
Of Mites and Men Of Mites and Men Writer: Terri Hughes Burton & Ron Milbauer Director: Mike Rohl August 15, 2011 #416
Carter has to struggle with indestructible machine-bugs threatening to destroy Global Dynamics. These construction mites have been created in order to build and maintain the Astraeus FTL spaceship on the mission to Titan. Unfortunately, the experiments in FTL communication have led to a malfunction in the mites, which makes it impossible to control them or shut them down. They relentlessly pursue their primary function all over GD, which is to construct ship part.
Clash of the Titans Clash of the Titans Writer: Eric Tuchman & Paula Yoo Director: Michael Robison August 22, 2011 #417
Preparations for the Titan mission have the unintended consequence of turning the local Eureka environment into Titan's atmosphere. Meanwhile, Eureka couples struggle to come to terms with each other and the DoD sends an investigator to evaluate Jack and Allison's relationship.
This One Time at Space Camp... This One Time at Space Camp... Writer: Amy Berg Director: Andrew Seklir August 29, 2011 #418
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.
One Small Step... One Small Step... Writer: Bruce Miller Director: Michael Robison September 12, 2011 #419
Grace embraces an honor that strains her relationship with Henry while Deputy Andy becomes an accidental guinea pig for the Astraeus mission when the FTL drive in GD accidentally activates, sending Andy to Titan. The GD crew must race against time to save him before he is permanently destroyed by the freezing, corrosive atmosphere.
One Giant Leap... One Giant Leap... Writer: Jaime Paglia Director: Matthew Hastings September 19, 2011 #420
With five hours before the Astraeus launch to Titan, Eureka struggles with black holes, who will stay and who will go, and how to say their goodbyes. Carter asks Allison to move in with him.
Seewhat Do You See What I See Writer: Amy Berg & Eric Tuchman Director: Matthew Hastings December 6, 2011 #421
(This is a holiday special and takes place outside the main story.) Sheriff Carter and Allison Blake 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.


Cast[]

Main characters[]

Recurring characters[]

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