List of Eureka Episodes - Episode List

Season 4 (2010–2011)

Season four marked the first crossover event with fellow Syfy series Warehouse 13. Douglas Fargo (Neil Grayston) appeared in the August 3, 2010 episode of Warehouse 13, while Claudia Donovan (Allison Scagliotti) of Warehouse 13 appeared on Eureka on August 6, 2010. James Callis joined the cast as Dr. Trevor Grant, a scientist from 1947.

Season 4 was split into two parts, plus a standalone Christmas special: the first nine episodes were shown in the summer of 2010, a Christmas episode was shown in December, and the final episodes began airing on July 11, 2011.

No. in series	No. in season	Title	Directed by	Written by	U.S. viewers (in millions)	Original air date
44	1	"Founder's Day"	Matt Hastings	Jaime Paglia	2.52	July 9, 2010 (2010-07-09)
While celebrating the anniversary of the town's founding, Sheriff Carter, Deputy Lupo, Drs. Blake, Deacon and Fargo inadvertently travel to the year 1947, when Eureka was a secret military base. Carter, Lupo and Fargo are arrested by the military suspected as spies, while Blake and Deacon fit in as a nurse and mechanic respectively. While Allison aids in their escapes, Deacon determines they were transported by a space-time bridge created by an invention of Einstein and associate Dr. Trevor Grant (James Callis), with the aid of their communicators. Grant helps them return to the year 2010. They succeed, but due to their presence in 1947, the five discover a few changes to the timeline; Jo never dated Zane, Kevin is no longer autistic, Henry is married to Grace (someone he barely knows), and Jack finds that he and Tess are still together. In the end, it is revealed that Grant has also transported to the present.
45	2	"A New World"	Michael Robison	Bruce Miller	2.21	July 16, 2010 (2010-07-16)
While Deacon is finding a way to reset the timeline, Allison discovers that Fargo is now the director of Global Dynamics, and she is now the medical director. Andy replaces Lupo as deputy, while she finds herself the head of security of GD; Andy realizes that Carter and the others changed the timeline. They also discover Grant is also in their present, and he reveals he did this on purpose, having wanted to see the future. The bridge device Deacon is working on overloads. Soon it is discovered that it is caused by a positronic lightning created by the alternate Fargo. Carter, Andy and Grant volunteer and succeed in shutting down the device. In the end, Deacon reveals the bridge device is destroyed beyond repair. The six travelers agree to never reveal to anyone that they changed the timeline—"If anyone knew about our trip," Jack says, "there'd be trouble."
46	3	"All the Rage"	Michael Rohl	Kira Snyder	2.29	July 23, 2010 (2010-07-23)
Carter is uncomfortable with Tess moving in with him. Meanwhile, Fargo has trouble coping with being director of Global Dynamics. After witnessing a malfunctioning demonstration in the non-lethal weapons lab, everybody inside Global Dynamics start showing signs of rage before they are no longer lucid. The only ones who are not infected are Allison, Carter and Tess, who were not in Global Dynamics at the time. Lupo helps them find a solution before she too is no longer lucid, in which case she cuffs herself. Eventually, using Fargo as a diversion, Tess is able to correct the malfunction, causing everybody in the building to return to normal. In the end, Carter confronts Tess about how uncomfortable he is with her moving in with him, and feels it would be best to split up. Deacon and Grant work on repairing the space-time bridge. However, in the process everything they touch disintegrates. Deacon soon learns that Grace played a prank on him.
47	4	"The Story of O2"	Colin Ferguson	Story: Jill Blotevogel Teleplay: Eric Tuchman	2.27	July 30, 2010 (2010-07-30)
Space Week begins normally enough, with everyone caught up in a rocket race to the moon and back. But when the town somehow becomes over-oxygenated (and very combustible), the returning rockets could blow up Eureka.
48	5	"Crossing Over"	Michael Robison	Paula Yoo	2.56	August 6, 2010 (2010-08-06)
This is a crossover episode with Warehouse 13. Claudia Donovan is invited to Eureka, where she hopes to find all the coolest new technology. But instead of new technology, she finds that objects are randomly teleporting into the town, apparently from 1947. It is revealed Dr. Grant is the cause, acting like a magnet to the past. They fix the problem, but Grant loses the ability to return to 1947.
49	6	"Momstrosity"	Michael Rohl	Terri Hughes Burton & Ron Milbauer	2.52	August 13, 2010 (2010-08-13)
All the AI in town begins to behave strangely as Sheriff Carter, Fargo, Dr. Grant, and Kevin go on a camping trip. They are soon attacked by a rogue Titan rover unit which has developed parental feelings over Kevin's school project, a tiny emotional robot. Meanwhile, Henry reveals to Grace about his time travel, and has her restart their relationship from the beginning.
50	7	"Stoned"	Joe Morton	Eric Wallace	2.30	August 20, 2010 (2010-08-20)
Zoe returns for a visit but the fun is cut short when people start to turn into stone. Meanwhile, the truth about Dr. Grant's past is put into jeopardy when the identity Fargo constructed for him draws attention.
51	8	"The Ex-Files"	Chris Fisher	Amy Berg	2.44	August 27, 2010 (2010-08-27)
The gang begins seeing visions of people from their pasts, while the town seems to be collapsing around them. Meanwhile, Dr. Grant gets involved with a mysterious faction. Note: Last appearance of Nathan Stark and Tess in the series.
52	9	"I'll Be Seeing You"	Michael Robison	Jaime Paglia	2.25	September 10, 2010 (2010-09-10)
Beverly and the Consortium, using the powercell from the stolen DED device to power their own Bridge Device, seek to return Dr. Grant to 1947. But when Carter intrudes, events are set in motion which trap both men in the past and threaten to alter present-day Eureka once again, while the powersurge has dire consequences for Allison.
53	10	"O Little Town"	Matt Hastings	Eric Tuchman	1.92	December 7, 2010 (2010-12-07)
(This is a holiday special, and takes place outside the main story.) Taggart's "Santaology" technology is tampered with, threatening to shrink the entire town out of existence.
54	11	"Liftoff"	Mike Rohl	Story: Jaime Paglia & Bruce Miller Teleplay: Bruce Miller	2.02	July 11, 2011 (2011-07-11)
Relationships get tested and a rescue effort begins to bring Zane and Fargo back from space, in the process all the electronics in Eureka are fried. While in space Fargo shares something about Jo to Zane. In the end Fargo appears before the Technology oversight committee.
55	12	"Reprise"	Matt Hastings	Amy Berg	2.16	July 18, 2011 (2011-07-18)
A new scientist arrives at Eureka, accidentally bringing a new digital virus which uploads itself to Eureka's music system, causing people to act out song lyrics. It is revealed that funding to plan a voyage to Titan is to be granted to Eureka. Beverly makes her (hidden) return, adding a season plot related twist to the end.
56	13	"Glimpse"	Michael Robison	Ed Fowler	1.77	July 25, 2011 (2011-07-25)
140 Days remaining until the Astraeus Mission Launch. Scientists compete to be on the Astraeus mission crew for the trip to Titan. Jo and Carter try out contact lenses that predict potential security breaches. At the end, it is shown that the system has flagged Allison's behavior to be a risk.
57	14	"Up in the Air"	Alexandra LaRoche	Kira Snyder	2.13	August 1, 2011 (2011-08-01)
115 Days remaining until the Astraeus Mission Launch. 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.
58	15	"Omega Girls"	Salli Richardson-Whitfield	Eric Wallace & Jaime Paglia	2.25	August 8, 2011 (2011-08-08)
106 Days remaining until the Astraeus Mission Launch. Too many aberrations in Allison's – now the newly appointed head of GD – behaviour 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 nano-technology. 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.
59	16	"Of Mites and Men"	Mike Rohl	Terri Hughes Burton & Ron Milbauer	2.23	August 15, 2011 (2011-08-15)
91 Days remaining until the Astraeus Mission Launch. 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 has led to a malfunction in the mites, that makes it impossible to control them or shut them down, so they relentlessly pursue their primary function, which is to construct ship parts. Unfortunately, the raw material used for this construction is tungsten, which is also the main construction component used at Global Dynamics. At the same time the Astraeus candidates have moved on to the next level of testing, and Zane Donovan, Douglas Fargo, Jo Lupo, Holly Marten, and Dr. Parrish are all isolated in a cell for psychological stress testing, the test is compounded by the fact that the construction mites are threatening to destabilize and collapse the entire area where the cell is located.
60	17	"Clash of the Titans"	Michael Robison	Eric Tuchman & Paula Yoo	2.03	August 22, 2011 (2011-08-22)
60 Days remaining until the Astraeus Mission Launch. Tiny, the Titan rover, is returned to GD after exploring Titan, and bringing samples of the atmosphere, surface etc. However when the compression shield is dropped, Tiny explodes, scattering the samples all over the area. Subsequently, the Eureka atmosphere becomes toxic and the primary toxins are discovered to be methane, ethane and nitrogen, which were all in the samples that Tiny brought home. At the same time, Allison and Carter's relationship is being scrutinized by a Department of Defense auditor, in order to assess whether it constitutes a potential threat to GD.
61	18	"This One Time at Space Camp…"	Andrew Seklir	Amy Berg	2.13	August 29, 2011 (2011-08-29)
45 Days remaining until the Astraeus Mission Launch. The Astraeus candidates go through their final interviews while Carter and Allison appeal their relationship audit.
62	19	"One Small Step"	Michael Robison	Bruce Miller	1.93	September 12, 2011 (2011-09-12)
7 Days remaining until the Astraeus Mission Launch. 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. Meanwhile, could a spate of meltings all across Eureka that have the entire town baffled be related to Taggart's return?
63	20	"One Giant Leap"	Matt Hastings	Jaime Paglia	1.87	September 19, 2011 (2011-09-19)
With five hours before the Astreaus launch to Titan, Carter asks Allison to move in with him, which she later accepts. Deacon finds a slight power shortage in the ship, forcing the countdown to be postponed. It has emerged that the power shortage, along with a number of power arrays across the town, is fueling a number of micro black holes across Eureka. Carter succeeds in evacuating Cafe Diem before it is destroyed. Jo and Carter decide the best course of action is to surround the lake with arrays, attracting all the micro black holes to that spot to continue the Astreaus launch, however they all merge to create a larger black hole. Carter, using Deacon's help, is able to eliminate the black hole with antimatter. Jo decides to leave Eureka. The countdown to the launch continues. However once Allison fills all the stasis pods with the ship's crew, mission control finds that somebody has hacked into the network, speeding the timer and redirecting the ship's destination. With Allison trapped inside, and a high probability the take off force will kill her, Carter breaks the reactor coolant pipes, overheating it with the hopes of aborting take-off; he succeeds in shutting down the reactor but the ship takes off despite this.
64	21	"Do You See What I See"	Matt Hastings	Amy Berg & Eric Tuchman	1.40	December 6, 2011 (2011-12-06)
(This is a holiday special, and takes place outside the main story.) Crashing over Eureka, a wave of color changes the town to animation of multiple styles and cartoonish effects, including Jack's jeep coming alive, Andy being turned into a cartoonish robot, and Jo becoming a princess. All this caused by the Super Photon Generator, a massive holographic matrix meant as Jack's Christmas gift for the kids (with help from Fargo). Meanwhile, Kevin, Zoey, and Jenna opened a gift early called "Holotown", a 'create your own story' book using holograms. It turns out that the gift the kids opened crossed signals with the Super Photon Generator. As the episode goes on, with the main characters aware of the changing animations, the kids add villainous Snow Ninjas to spice up the story. As Jack, Andy, Allison, and Jo make it to the generator, they see Dr. Drummer- a scientist from the last holiday special- trying to fix the generator; but as he is, the snow ninjas join to create a 50 foot snow monster. The kids realize the connection between the generator and their book and give the others a fighting chance with Kevin turning them into Anime to defeat the snow ninja monster. Jack gets Jo close enough to throw a bomb into the monster, blowing it up. As the others fight the Snow Ninja Monster, Allison, Andy, and Dr. Drummer finally repair the generator, returning everyone to normal perspective. At the end of the episode, everyone gets together for a Christmas dinner at the smart house.

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