1 :01x01 - Pilot

An accident leads a U.S. Marshal and a teenage girl (who later is revealed to be his daughter) to a peculiar town populated by scientists and their families where 10-year-old boys are in 11th grade, the local diner doesn't believe in menus, and E=MC² was just the beginning. Just as the Marshal starts to get settled into the swing of things, a local scientist develops a bomb that seems to appear anywhere and eats all the matter around it.

2 :01x02 - Many Happy Returns

The citizens of Eureka attend the funeral of Susan Perkins, only to find out that she is in fact alive. Meanwhile the Sheriff moves into an underground bunker that is actually a 'smart house' controlled by a computer dubbed 'S.A.R.A.H., and begins to investigate a 'ghost' that has been appearing in town.

3 :01x03 - Before I Forget

Something starts to steal the townspeople's memory...

4 :01x04 - Alienated

After hosting a movie party, Spencer is found the next day in the middle of a crop circle, claiming he was abducted by aliens; and then other people who attended the party start to go missing as well. Elsewhere, the legislator responsible for Eureka's funding visits the town, and gets dragged into a Sector 5 experiment...

5 :01x05 - Invincible

An unpredictable researcher accidentally unleashes a dangerous artifact which was previously hidden by Nathan Stark.

6 :01x06 - Dr. Nobel

A sleeping weapons system is accidentally awakened by Fargo and Spencer. Henry tries to avert the pending catastrophe with the help of a retired, nonsensical scientist.

7 :01x07 - Blink

Carter investigates an unusual car accident. Meanwhile, Stark, under the stress of completing a project on time, pressures two research teams to produce results.

8 :01x08 - Right as Raynes

A former resident returns to Eureka and creates mayhem which threatens Global Dynamics, prompting Stark to take action.

9 :01x09 - Primal

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

10 :01x10 - Purple Haze

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.

11 :01x11 - H.O.U.S.E. Rules

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.

12 :01x12 - Once in a Lifetime

Ambition trumps common sense when Stark is given a chance to try out the Top-secret artifact. Once it's tested, Eureka warps into the future and ends up in 2010, where the town is different.

13 :02x01 - Phoenix Rising

Taggart's theory is that solar flares caused by the eclipse, or the 'Phoenix Effect', are to blame when people start to spontaneously combust.
When Carter discovers that a blast of radiation from the artifact had penetrated the wall of the chamber and is actually to blame for the spontaneous combustion, it becomes a race against time to save the other two people exposed - Nathan and Kevin!

14 :02x02 - Try Try Again

Fargo accidentally triggers a prototype for a personal force field, which goes out of control, forcing Carter to enlist Stark's help.

15 :02x03 - Unpredictable

Dr. Whiticus creates an incredible "weather machine" intended to reverse the effects of global warming which instead stirs unexpected results.

16 :02x04 - Games People Play

Carter suffers a blow to the head, and after arguing with Zoe, he suddenly finds himself in a parallel Eureka, where the residents seem to be mysteriously vanishing.

17 :02x05 - Duck, Duck Goose

Falling space debris threatens Eureka residents and Carter turns to high school science fair participants to solve the problem. Specifically, he taps a student science project created to harness the sun's energy. Also, Zoe gets an eco-friendly automobile.

18 :02x06 - Noche de Suenos

One of the Global Dynamics tanker trucks spills, potentially causing a change in everyone's sleep habits... In the course of the episode, we come to learn that Global Dynamics has developed a technology that enables them to distill six months of the town waste and by-products into one truck, an amount that would normally fill Lake Erie.

19 :02x07 - Family Reunion

Fargo's grandfather awakens after 50 years in cryogenic suspension and accuses his rival of putting him there and stealing his work.

20 :02x08 - E=MC...?

As an experiment that will recreate the first moment of the origins of the universe, the Big Bang, goes terribly awry, the town’s geniuses turn into morons, leaving the fate of Eureka in the hand of Jack Carter and an antisocial young ubergenius.

21 :02x09 - Sight Unseen

An abandoned research project on invisibility returns to haunt Eureka. Carter and Zoé become tangled in a web of strange occurrences that lead to Carter’s disappearance and the possibility that he might never reappear.

22 :02x10 - God is in the Details

Sudden muteness, human bioluminescence and faucets running blood cause many of Eureka’s citizens to believe that they are the victims of a biblical plague.

23 :02x11 - Maneater

Sheriff Jack Carter becomes absolutely irresistible to every woman in Eureka. But if he doesn't get his mojo under control, they might just eat him alive.

24 :02x12 - All That Glitters

Beverly Barlow returns to town just as a parasitic bacterium threatens to destroy Eureka, by turning everything to gold and then into rust --- people included.

25 :02x13 - A Night at Global Dynamics

Nathan Stark and Jack Carter must put aside their rivalry to stop a deadly bacteria from destroying the town and killing Allison’s son. But can Carter ignore Stark’s crimes, as well?

26 :03x01 - Bad to the Drone

The search is one for an escaped drone as Eva Thorne arrives to assist the clean up of damages which Global Dynamics has caused.

27 :03x02 - What About Bob?

Carter and Allison investigate when a scientist mysteriously disappears from a sealed biosphere. Meanwhile, the "Fixer" tries to make Eureka's efforts more profitable.

28 :03x03 - Best in Faux

Eureka's annual dog show is underway and is like none other. Meanwhile, Sheriff Carter experiences an earthquake; Zoe debates quitting the accelerated physics program; and Allison starts the process of fitting her wedding dress.

29 :03x04 - I Do Over

It's Allison and Stark's wedding day and Carter finds himself reliving it over and over. Meanwhile, Carter's sister, Lexi, visits the town.

30 :03x05 - Show Me the Mummy

A search for a mummy ensues after a famed archaeologist opens the tomb of an Egyptian queen at Global Dynamics.

31 :03x06 - Phased and Confused

Carter's job is made more difficult when a super hero emerges. Meanwhile, Zoe and her friends are imperiled when Thorne makes a subterranean search beneath Eureka.

32 :03x07 - Here Come the Suns

The Eureka mayoral race is overshadowed by the sudden arrival of a second sun, forcing Carter, Allison and Zane to investigate it more closely.

33 :03x08 - From Fear to Eternity

Trust issues are produced by a scientific find, along with sinister results. Zoe's life is in jeopardy, and Eva Thorne knows what has caused the predicament.

34 :03x09 - Welcome Back Carter

Carter interviews for a job with the Department of Homeland Security, after being terminated as the sheriff. Deputy Lupo decides to resign after discovering that a very personable robot is the new sheriff.

35 :03x10 - Your Face Or Mine

Carter's recertification exam tests both his body and mind. Allison explains the new town wide DNA-monitoring security system to Henry which leaves Deputy Lupo injured during its initial scan.

36 :03x11 - Insane In The P-Brane

Dr. Tess Fontana reopens Section 5, causing objects to become ambulatory , possibly due to poltergeists.

37 :03x12 - It's Not Easy Being Green

Carter finds himself chasing down creation of blob-ical like proportions when a series of escalating pranks turn deadly. Elsewhere, long-term rivals from Area 51 come to Eureka for a bowling tournament.

38 :03x13 - If You Build It...

Eureka's teenagers who appear to have been manipulated while asleep, gathered in a field where they assembled a strange structure comprised of scrap metal and electronics.

39 :03x14 - Ship Happens

Henry's ship returns causing Carter to fear it maybe linked to the town's deadly electrical anomalies.

40 :03x15 - Shower the People

Allison's baby shower fetches her a load of eco-friendly gifts and the discovery of a drowned scientist in a location where drowning is impossible.

41 :03x16 - You Don't Know Jack

Global Dynamics sonic cleaning coincides with a phenomenon in which the citizens of Eureka develop a communal form of Alzheimer's disease. Meanwhile, Allison goes into labor.

42 :03x17 - Have an Ice Day

The first day on the job as temporary head of Global Dynamics proves daunting for Tess when a new Ice Age comes to Eureka; and a familiar face returns in the process.

43 :03x18 - What Goes Around, Comes Around

Tess has a job offer from Australia, Zoe is prepared to leave for Harvard and Carter has a magnetic disturbance above Eureka to contend with, in the third season finale.

Let's All Go to Eureka

44 :04x01 - Founder's Day

It's Founder's Day in Eureka and everyone is in the spirit of the celebration until Jack is transported back to 1947 where he meets some familiar faces along the way. Will they be able to get back to 2010 or will they be stuck forever in 1947 where Eureka is not a town, but a camp.

45 :04x02 - A New World

When the 5 get back to their time, things are changed everywhere. As the Henry tries to fix the machine that transported them in the first place, Dr. Grant is making himself comfortable as he can. Jack is still trying to wrap his mind at the fact that he asked Tess something that she says yes to and the fact that the group's positions changed. As one thing leads to another, a twist happens and things get a little dicey.

46 :04x03 - All the Rage

When a prototype sets everyone into bad temper mode, the issue escalates and gets worse beyond the control of what Jack can handle. As Jack and Allison and Tess are the only sane people at Global Dynamics they have to devise a plan that will make everything calm and happy again. Meanwhile, Henry is helping Dr. Grant re-build the bridge that got them back to the new world except everything they touch disappears.

47 :04x04 - The Story of O2

It's space week in Eureka, and everyone is gearing up for the rocket race - except for Carter. General Mansfield is in town for the big Race to the Moon, and is debriefed on a new oxygen-generating fluid designed, called TAP, for colonizing Mars. When the question about someone using TAP to fuel their rocket, the whole town of Eureka is in danger and it is up to Kevin to save the day this time. Will he do it, or will Jack come back to see charred remains of his friends?

48 :04x05 - Crossing Over

Claudia Donovan visits Eureka to see if Fargo's promises of wondrous devices are true, but she finds herself in the middle of a mystery suitable for Warehouse 13 when objects begin to appear randomly around the town and GD, and it must be solved before there are deadly consequences.

49 :04x06 - Momstrosity

When Sara gives Andy a (as Zane calls it ) an EMO download to give him emotion, she inadvertently affects all Level 6 AIs. Including Tiny. She escapes while being transported to NASA and is on the loose. Meanwhile, Jack takes Kevin camping with Fargo and Grant and Jack is not happy that Grant is there. They argue on who is with Allison and who is not and they are interrupted by Tiny who has an attachment to a certain object of Kevin's.

50 :04x07 - Stoned

Love is in the air as Carter gets fed up with Grant's pursuit of Allison, Zoe conceals a budding new relationship with an older man, and Henry courts Grace. But all the emotions may have to be put on simmer when people in town start turning to stone.

51 :04x08 - The Ex-files

Eureka's citizens face the return of people from the past; Global Dynamics tests a new device.

52 :04x09 - I'll Be Seeing You

When Grant and Carter become stranded, they must race back in time to save Eureka.

53 :04x10 - O' Little Town...

Carter's plans to visit family for the holidays are thwarted when the town is trapped by a electromagnetic shield.

54 :04x11 - Liftoff

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.

55 :04x12 - Reprise

When Holly Martin from the Senator's office comes to Global Dynamics, Fargo gets nervous that she is going to get him fired. Jo and Zane's relationship gets complicated and Allison is dragged into something from a familiar foe.

56 :04x13 - Glimpse

Jack and Jo have PALS installed in their eyes to be able to assess any potential security threats that go on in Eureka. However, when they malfunction, Jack and Jo see a prediction that could be the end of Eureka. Meanwhile, Jo and Zane continue a romance that Jo keeps saying is over, but it is clear that it could only be the beginning.

57 :04x14 - Up In The Air

The second phase of the training for the "Astraeus" mission is underway and Fargo finds out that he has to not only compete against Parrish for Holly, but also for a spot on the mission. Meanwhile, Anti-Matter is locked away in a bank that disappears and Jack is on the case as always to save the day.

58 :04x15 - Omega Girls

When Jo and Zoe get back to Eureka, they find that all the town has been knocked out and there is no phones available to call anyone. They race to try to find what happened and who could be behind it all.

59 :04x16 - Of Mites And Men

When mites threaten to take down Global Dynamics, Jack is called into action since Jo is in the middle of training. Allison is struggling with the fact that everyone things that her brain doesn't work and she is determined to prove that she is back in action again.

60 :04x17 - Clash Of The Titans

Henry and Grace plan for a quiet wedding while Jo has other plans as she takes Grace with her to plan the big day..again. The Department of Defense does an audit on Jack and Allison's relationship to see if there are an security risks. Meanwhile, TINY gets back with her mission on Titan with some poisonous gases that could be the end of Eureka.

61 :04x18 - This One Time At Space Camp…

When the "Astraeus" mission is put in jeopardy by strange things, Jack starts to have Deje Vu with the things that are happening around Eureka. The final lists for the chosen 20 comes out and not everyone is happy about it.

62 :04x19 - One Small Step

Carter and Taggart probe the mystery of a melted cow; Jo questions what she wants from life; a malfunction strands Deputy Andy on Titan; Carter and Allison contemplate what's next for their relationship.

63 :04x20 - One Giant Leap

In the Season 4 finale, Carter and Jo respond to a mysterious attack on the presidential convoy; good-byes are exchanged before the Astraeus mission is launched; and cosmic anomalies threaten Eureka.

64 :04x21 - Do You See What I See?

The quaint town of geniuses is transformed into animated versions of themselves. 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.

65 :05x01 - Lost

The Astraeus crew returns to Eureka four years later and must adapt to a myriad of changes, including a more oppressive version of Deputy Andy, in the Season 5 premiere.

66 :05x02 - The Real Thing

The town huddles in a last attempt to locate the vanished Astraeus before it's too late!

67 :05x03 - Force Quit

Beverly Barlowe resurfaces in Eureka seeking Carter's help to free the Astraeus crew, and the rescue plan lands Carter in the crew's virtual world.

68 :05x04 - Friendly Fire

The Astraeus crew tries to overcome their Matrix Eureka experience. Meanwhile, Fargo struggles with Holly's death and old animosities erupt as Parrish's latest project threatens to ignite the town.

69 :05x05 - Jack Of All Trades

The crew moves forward after an ordeal and Warren's visit adds to the pressure.

70 :05x06 - Worst Case Scenario

Henry conducts a preparedness drill that winds up a disaster and Fargo faces a hard reality.

71 :05x07 - Ex-Machina

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

72 :05x08 - In Too Deep

73 :05x09 - Smarter Carter

74 :05x10 - The Honeymooners

75 :05x11 - TBA

76 :05x12 - TBA

77 :05x13 - TBA