Pilot

S1 : E1 | TV-14 | 85 min | Aired: 07.18.06

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.

Many Happy Returns

S1 : E2 | TV-14 | 43 min | Aired: 07.25.06

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.

Before I Forget

S1 : E3 | TV-14 | 44 min | Aired: 08.01.66

Occurrences of short-term memory loss begin when visiting scientists hit town, and Jack has to determine the cause while not letting down Zoe who is acting in a school play.

Alienated

S1 : E4 | TV-14 | 44 min | Aired: 08.08.06

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.

Invincible

S1 : E5 | TV-14 | 44 min | Aired: 08.15.06

A lab accident causes a scientist to, seemingly, become indestructible, but Carter and Stark have their own concerns.

Dr. Nobel

S1 : E6 | TV-14 | 43 min | Aired: 08.22.06

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.

Blink

S1 : E7 | TV-14 | 42 min | Aired: 08.29.06

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.

Right as Raynes

S1 : E8 | TV-14 | 44 min | Aired: 09.05.06

Odd fluctuations in computer-controlled environments may have something to do with the return of Eureka's prodigal son.

Primal

S1 : E9 | TV-14 | 41 min | Aired: 09.12.06

Taggart achieves a medical breakthrough while Fargo invents a device that bridges the divide between computers and human brains.

Purple Haze

S1 : E10 | TV-14 | 44 min | Aired: 09.19.06

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.

H.O.U.S.E Rules

S1 : E11 | TV-14 | 44 min | Aired: 09.26.06

A bad day in the lab forces Carter to rethink his decision to live in Eureka, prompting an intervention from S.A.R.A.H. (the self Activated Residential Automated Habitat).

Once in a Lifetime

S1 : E12 | TV-14 | 44 min | Aired: 10.03.06

After another lab accident Jack wakens to a whole new world.

Phoenix Rising

S2 : E1 | TV-14 | 44 min | Aired: 07.10.07

Henry and Jack struggle to deal with their losses as people begin burning to death for no apparent reason. At Global, Stark awaits the decision of the DOD.

Try, Try Again

S2 : E2 | TV-14 | 44 min | Aired: 07.17.07

When Fargo activates a mysterious device on Allison's first day, he endangers not only himself, but Global Dynamics and Eureka as well.

Unpredictable

S2 : E3 | TV-14 | 44 min | Aired: 07.24.07

A surprise visitor disrupts Jack and Zoe's lives; strange weather must be tracked to its source before it becomes an "ice funnel of death."

Games People Play

S2 : E4 | TV-14 | 44 min | Aired: 07.31.07

The people of Eureka start disappearing, and Jack is the only one who notices.

Duck, Duck Goose

S2 : E5 | TV-14 | 43 min | Aired: 08.07.07

Debris starts raining down on Eureka on the day of the school's science fair, and there may be a connection to Zoe.

Noche de suenos

S2 : E6 | TV-14 | 44 min | Aired: 08.14.07

Groups of people begin sharing dreams in some embarrassing and conflicting ways as a result of some accident of convolutedly blended pairing of technologies and havoc ensues.

Family Reunion

S2 : E7 | TV-14 | 44 min | Aired: 08.21.07

Fargo's grandfather is discovered in a cryo-stasis chamber, but no one can determine how he got in there. Zoe pursues another mystery involving her dad and a dozen roses.

E=MC…?

S2 : E8 | TV-14 | 44 min | Aired: 08.28.07

When Allison puts a newly hired genius in Jack's care, but then an accident in a lab causes most of GD to lose their smarts, and he may be the only one with the solution.

Sight Unseen

S2 : E9 | TV-14 | 44 min | Aired: 09.04.07

Carter begins to disappear on his anniversary, Zoe is stuck with another student for a school project, and Henry and Nathan examine the item Henry found.

God Is in the Details

S2 : E10 | TV-14 | 44 min | Aired: 09.11.07

Zoe and her friends lose their voices, but whatever is causing the symptoms has an even worse effect on Allison and her only hope comes from an unusual source.

Maneater

S2 : E11 | TV-14 | 43 min | Aired: 09.18.07

All the women of Eureka begin to pursue Carter, so something must be very wrong.

All That Glitters

S2 : E12 | TV-14 | 44 min | Aired: 09.25.07

The town's metals begin to spontaneously turn to gold, but the wealth may be as fleeting as the town when the structures begin deteriorating.

A Night in Global Dynamics

S2 : E13 | TV-14 | 44 min | Aired: 10.02.07

A flesh eating virus has infected Global Dynamics, and the building goes into a security protocol that endangers everyone's lives.

Bad to the Drone

S3 : E1 | TV-14 | 44 min | Aired: 07.29.08

The D.O.D. has sent in a business shark to perform an evaluation of Global Dynamics' viability, and everything that could possibly go wrong, does.

What About Bob?

S3 : E2 | TV-14 | 44 min | Aired: 08.05.08

Carter and Allison search for a missing man in a bio-dome while Eva Thorne makes changes in town in the name of balance and efficiency.

Best in Faux

S3 : E3 | TV-14 | 44 min | Aired: 08.12.08

Carter is frustrated when he's told to investigate when robotic dogs begin exploding, believing it's a waste of his time.

I Do Over

S3 : E4 | TV-14 | 44 min | Aired: 08.19.08

It's Allison's wedding day, and Carter is stuck in a time loop that causes him to relive it over and over. Unfortunately, there's no simple act that will right things.

Show Me the Mummy

S3 : E5 | TV-14 | 44 min | Aired: 08.26.08

An opened sarcophagus unleashes a plague onto those who opened the tomb, and when it threatens Eureka, Carter has to devise a temperate fix.

Phased and Confused

S3 : E6 | TV-14 | 44 min | Aired: 09.09.08

While Jack keeps having to rescue Lexi from a bumbling superhero, Zoe gets trapped while exploring an abandoned facility under the high school with her friends.

Here Come the Suns

S3 : E7 | TV-14 | 43 min | Aired: 09.16.08

The appearance of a second sun makes election week in Eureka a little more intense, and gives Eva Thorne an opening that may mean the end of Global Dynamics.

From Fear to Eternity

S3 : E8 | TV-14 | 44 min | Aired: 09.23.08

All of Eva Thorne's secrets are revealed when she pushes for early destruction of the bunker. Zoe begins to experience the effect of the substance in which she slipped.

Welcome Back, Carter

S3 : E9 | TV-14 | 44 min | Aired: 07.10.09

Sheriff Carter interviews for a new job, Zoe braces herself for change, and someone works behind the scenes to make sure the new sheriff, a robot, fails.

Your Face or Mine

S3 : E10 | TV-14 | 44 min | Aired: 07.17.09

Jo displays atypical behavior after a DNA scan malfunctions, unfortunately it's while she's interim sheriff when Carter is required to undergo a 48-hour DOD recertification test.

Insane in the P-Brane

S3 : E11 | TV-14 | 44 min | Aired: 07.24.09

Carter finds out more than he bargained for when he's trapped in an alternate dimension with the new scientist. Meanwhile, the father of Lexi's babies comes to town.

It's Not Easy Being Green

S3 : E12 | TV-14 | 44 min | Aired: 07.31.09

A bowling tournament brings a rival team from Area 51 to town, but when a practical joke goes too far Jack may be the town's only hope for survival.

Ship Happens

S3 : E14 | TV-14 | 44 min | Aired: 08.14.09

Henry tries to figure out why his spaceship came home. The sheriff's office tries to return all the property the spaceship used to create its boson safety net.

Shower the People

S3 : E15 | TV-14 | 44 min | Aired: 08.21.09

Women who attended Allison's baby shower are turning up drowned and with no apparent source of water. There doesn't seem to be a way to extract the data stored in Kim's body.

You Don't Know Jack

S3 : E16 | TV-14 | 44 min | Aired: 08.28.09

Jack and Allison are trapped within a building during a countdown for a sonic cleaning. Fargo messes with the memory recording system, which leads to widespread amnesia.

Have an Ice Day

S3 : E17 | TV-14 | 44 min | Aired: 09.11.09

An immense ice core from Russia threatens to turn Eureka into a giant ice cube and the residents into icicles.

What Goes Around, Comes Around

S3 : E18 | TV-14 | 44 min | Aired: 09.18.09

Carter deals with a new magnetic force tearing apart the town, Zoe gets unexpected news about her college application and Tess drops a bombshell about a job offer.

Founder's Day

S4 : E1 | TV-14 | 44 min | Aired: 07.09.10

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.

A New World

S4 : E2 | TV-14 | 44 min | Aired: 07.16.10

The gang returns from 1947 and discover that things are not as they remember them. And Dr. Grant came along.

All the Rage

S4 : E3 | TV-14 | 44 min | Aired: 07.23.10

Wil Wheaton guest stars as Dr. Isaac Parrish, an underappreciated scientist whose hostility appears to have gone viral.

The Story of O2

S4 : E4 | TV-14 | 44 min | Aired: 07.30.10

Allison deals with a major problem during Eureka's space week festival.

Crossing Over

S4 : E5 | TV-14 | 44 min | Aired: 08.06.10

Claudia Donovan pays a visit to Eureka, hoping to see some amazing technology. She gets more than she bargained for when seemingly random objects begin appearing around town.

Momstrosity

S4 : E6 | TV-14 | 44 min | Aired: 08.13.13

Allison accepts Carter's offer to include Kevin in a camping trip, and Henry decides to level with Grace while a very peculiar relationship threatens Eureka and the campers.

Stoned

S4 : E7 | TV-14 | 44 min | Aired: 08.20.10

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.

The Ex-Files

S4 : E8 | TV-14 | 44 min | Aired: 08.27.10

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.

I'll Be Seeing You

S4 : E9 | TV-14 | 44 min | Aired: 09.10.10

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 a stolen project.

O Little Town

S4 : E10 | TV-14 | 44 min | Aired: 12.07.10

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.

Liftoff

S4 : E11 | TV-14 | 44 min | Aired: 07.11.11

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.

Reprise

S4 : E12 | TV-14 | 44 min | Aired: 07.18.11

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.

Glimpse

S4 : E13 | TV-14 | 44 min | Aired: 07.25.11

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.

Up in the Air

S4 : E14 | TV-14 | 44 min | Aired: 08.01.11

Carter must solve an only-in-Eureka bank robbery before the town floats away, while Allison deals with unsettling episodes of lost time.

Omega Girls

S4 : E15 | TV-14 | 44 min | Aired: 08.08.11

The predicted danger posed by Allison materializes when she is subjected to mind control to steal Eureka's secrets.

Of Mites and Men

S4 : E16 | TV-14 | 44 min | Aired: 08.15.11

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.

Clash of the Titans

S4 : E17 | TV-14 | 44 min | Aired: 08.22.11

Preparations for the Titan mission have the unintended consequence of turning the local Eureka environment into Titan's.

This one Time at Space Camp

S4 : E18 | TV-14 | 44 min | Aired: 08.29.11

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…

S4 : E19 | TV-14 | 44 min | Aired: 09.12.11

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.

One Giant Leap…

S4 : E20 | TV-14 | 44 min | Aired: 09.19.11

Hours before the launch of the Titan mission Eureka struggles with black holes and, having decided who will stay and who will go, goodbyes.

Do You See What I See

S4 : E21 | TV-14 | 44 min | Aired: 12.06.11

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.

Lost

S5 : E1 | TV-14 | 44 min | Aired: 04.16.12

Following its accidental launch, the Astraeus returns to Eureka and the crew discovers that, while they thought they were gone for short time, four years had elapsed.

The Real Thing

S5 : E2 | TV-14 | 44 min | Aired: 04.23.12

The town comes together in a final attempt to locate the lost Astraeus.

Force Quit

S5 : E3 | TV-14 | 44 min | Aired: 04.30.12

The ship is finally found but the crew has been taken. When Carter is tasked with attempting to rescue the kidnapped crew by following them into the virtual Eureka.

Friendly Fire

S5 : E4 | TV-14 | 44 min | Aired: 05.07.12

With life back to normal, the Astraeus crew struggles to overcome their Matrix Eureka experience: what was real, what wasn't and what could become self-fulfilling prophecy.

Jack of All Trades

S5 : E5 | TV-14 | 44 min | Aired: 05.14.12

Warren Hughes makes an unexpected visits to evaluate the Astraeus crew. Unfortunately his evaluations coincide with crew members' tendencies to swap minds with Jack.

Worst Case Scenario

S5 : E6 | TV-14 | 43 min | Aired: 05.21.12

A disaster simulation causes a disaster. Then another. And another. Fargo finds Holly in the computer.

Ex Machina

S5 : E7 | TV-14 | 44 min | Aired: 06.04.12

Fargo is convinced that Holly is still inside of the Matrix computer, but the DOD is determined to wipe its hard drive clean -- losing Dr. Marten forever.

In Too Deep

S5 : E8 | TV-14 | 44 min | Aired: 06.11.12

Eureka celebrates Feynman day with a plethora of practical jokes. While mostly harmless the jokes make it challenging to identify the real catastrophes Eureka is so prone too.

Smarter Carter

S5 : E9 | TV-14 | 44 min | Aired: 06.18.12

Allison's brother visits the newlyweds to give Jack a hard time but Jack's intellect rises to the occasion. Henry and Zane work on freeing Holly from her virtual reality cage.

The Honeymooners

S5 : E10 | TV-14 | 44 min | Aired: 06.25.12

Jack's idea of a romantic honeymoon doesn't quite mesh with Allison's. Holly tries on her new body. Jo and Andy followup on an investigation begun by Jack's predecessor.

Mirror, Mirror

S5 : E11 | TV-14 | 44 min | Aired: 07.02.12

When Grace's spying is revealed, mistrust is in the air. Major Shaw shows up to take control of the situation just as a geo-engineering project cuts off communications.

Double Take

S5 : E12 | TV-14 | 44 min | Aired: 07.09.12

The Smart Dust control unit is still on the fritz and wreaking havoc on the town's communications systems. The bio-printer has gone missing and Holly is definitely not herself.

Just Another Day

S5 : E13 | TV-14 | 44 min | Aired: 07.16.12

Wormholes cause trouble on moving day. Or is moving day causing trouble with wormholes? While Jack tries to fix the wormholes Fargo is determined to something about moving day.