Episode 1 : Founders' Day
Carter, Allison, Jo, Fargo and Henry find themselves transported back to Eureka 1947. Against all odds and with the help of a budding local scientist, they find a way to set back to the present but find that "home" is now a very different place.
Episode 2 : A New World
Carter and his fellow travelers begin to realize the startling implications of their return to Eureka -- and of Dr. Grant’s unnerving appearance in their midst.
Episode 3 : All the Rage
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 : The Story of O2
Directed by Colin Ferguson! Allison struggles to relate to her son and deals with inadvertent mayhem during Eureka’s Space Week festival, while Carter wonders if the Zoe he is about to visit at Harvard will be the daughter he remembers. Jamie Kennedy guest stars!
Episode 5 : Crossing Over
Mysterious objects start popping up all over town, threatening to erase Eureka, and Carter (Colin Ferguson) needs the help of Claudia (guest star Allison Scagliotti) from Warehouse 13 to fix it before the present becomes history.
Episode 6 : Momstrosity
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 : Stoned
Romantic relationships are in flux. Zoe (Jordan Hinson) is home for a visit and hints at a new heartthrob. Henry (Joe Morton) is courting his wife while Dr. Grant (James Callis) and Carter (Colin Ferguson) spar over Allison. Jo (Erica Cerra), 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 (John Reardon) says he found ancient human remains at the site and refuses to allow the build to continue. His former student Zoe offers to help at the dig, causing Carter to wonder if her interest is anthropology or the anthropologist. Jo and her contractor, Tanya Zimmer (Stephanie Belding) just want the site cleared, now. How far would Zimmer go? Carter and Zoe are forced to consider the worst when they find Thurgood apparently encased in stone.
Episode 8 : The Ex-Files
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. Tess Fontana (Jaime Ray Newman) challenges Allison (Salli Richardson-Whitfield) over relationship issues, and Fargo (Neil Grayston) finds his desperate attempts to please General Mansfield (Barclay Hope) complicated by a long-forgotten nemesis. Zane (Niall Matter) admits he is flirting with Zoe (Jordan Hinson) to get Carter'’s (Colin Ferguson’s) goat, then begins to show Jo (Erica Cerra) an unusual - and unexpected - amount of affection. And Carter’'s visitor is the most startling of all...
Episode 9 : I'll Be Seeing You
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. The theft has unexpected roots in a plan hatched by Dr. Grant (James Callis) and his colleague Adam Barlowe (Elias Toufexis), one honorable in intent but taken to drastic extremes. Zane (Niall Matter) insists that Grant is the logical prime suspect, an allegation bolstered by the fact that Grant has gone missing. While Allison and Henry (Joe Morton) pursue a lead on locating the device, Carter and Jo (Erica Cerra) dig into Grant'’s records. There, they find an astonishing connection between their supposed friend Grant and the manipulative Beverly Barlowe (Debrah Farentino).
Episode 10 : O' Little Town
As the Global Dynamics employees celebrate the season at the company holiday party, staff member Dr. Noah Drummer (guest star Chris Parnell) nearly absconds with a volatile experiment. The halls get seriously decked when Dr. Drummer’s unstable hydrogen crystal starts to grow at a frightening rate. Carter (Colin Ferguson) and Henry (Joe Morton) attempt to deal with the potentially explosive crystal, but before long the true scope of the problem is revealed, and it will take more than tinsel and carolers to save Christmas and Eureka. Former series regular Matt Frewer also returns as Taggert.
Episode 11 : Liftoff
Carter (Colin Ferguson) and Allison (Salli Richardson-Whitfield) find that balancing their personal and professional lives can be tricky, while the cyber-romance between S.A.R.A.H. and Deputy Andy undergoes the acid test.
Episode 12 : Reprise
Following his unauthorized trip, Fargo (Neil Grayston) dreads the arrival of a visitor from the D.O.D., but Dr. Holly Marten (Felicia Day) seems more flustered than fearsome. Holly's interest in Global Dynamics' FTL (Faster Than Light) device leads to more revelations.
Episode 13 : Glimpse
The Astraeus mission crew will be small, so Eureka's scientists are in a fevered competition to get on board. Fargo (Neil Grayston) and Dr. Holly Marten (Felicia Day) share the daunting task of evaluating the eager candidates -- and a growing attraction to each other. While Allison (Salli Richardson-Whitfield) insists that she does not want a place on the trip to Titan, a discovery from her other-timeline self brings this into question. Among the competing scientists, including the curiously familiar Dr. Lee (Stan Lee), Dr. Parrish (Wil Wheaton) is especially determined to be selected. When Fargo cuts him in the first round, Parrish is livid. Will he seek revenge? To ensure safety on the Astraeus mission as well as in Eureka, Zane (Niall Matter) has engineered a cutting-edge security system, called P.A.L.s -- Predictive Algorithm Lenses. These contacts give anyone wearing them an immediate readout of the level of risk for whatever, or whomever, they are looking at. While Fargo and Jo (Erica Cerra) love the devices, Carter (Colin Ferguson) is less trusting but agrees to test a pair. The P.A.L.s offer a helpful peek into the future, but what Carter and Jo don't see might lead to a deadly meltdown.
Episode 14 : Up in the Air
The town gets a workout as the Astraeus candidates strive to meet the mission's physical fitness requirements. Jo Lupo (Erica Cerra) is running boot camp, Zane (Niall Matter) and Grace (Tembi Locke) are pushing themselves to the limit.
Episode 15 : Omega Girls
Allison (Salli Richardson-Whitfield) is back in command at GD but Carter (Colin Ferguson) is certain that something is seriously wrong with her. He persuades Henry (Joe Morton) and Zane (Niall Matter) to snoop into her medical files.
Episode 16 : Of Mites and Men
Allison (Salli Richardson-Whitfield) is almost positive that she has fully recovered from Beverly's attack, but Carter's (Colin Ferguson) overprotective attitude, though sweet, isn't helping. Even worse, Senator Wen (Ming-Na) refuses to reinstate Allison as interim director of Global Dynamics, further undermining her confidence. When Carter discovers that the Astraeus mission's construction mites are devouring the very structure of GD, can Allison rise to the challenge? Clueless about the crisis unfolding, Jo (Erica Cerra), Fargo (Neil Grayston), Holly (Felicia Day) and Parrish (Wil Wheaton) find themselves locked up together in isolation, a surprise psychological stress test for the mission. As the four embark on task after bizarre task, tempers - and temperatures - heat up after Zane (Niall Matter) gatecrashes the test and Larry (Christopher Jacot) tweaks the chamber's settings to gauge their reactions. A sudden accident makes the candidates realize that this is no longer a test: they are in very real, very immediate danger. Despite their frustrations and hostility with each other, they must form a cohesive team fast - or die.
Episode 17 : Clash of the Titans
Henry (Joe Morton) and Grace (Tembi Locke) want a small, quiet wedding but Jo (Erica Cerra), perhaps missing the wedding she and Zane (Niall Matter) never had, has more elaborate plans in mind. For Carter (Colin Ferguson) and Allison (Salli Richardson-Whitfield), their romantic attachment is developing only-in-Eureka complications: the Department of Defense has sent "relationship auditor" Warren Hughes (Wallace Shawn) to assess them. Things get off to a rocky start and any hope of making a good impression slips away when Tiny, returning from Titan, explodes on arrival and poisonous gases begin threatening the town. While Carter and Henry try to find the source of the contamination, Fargo (Neil Grayston) and Holly (Felicia Day) struggle to remain focused on their Astraeus training despite their growing attraction. The pair have decidedly different ideas about how to handle the situation and Zane's glib advice just adds to their frustration. With Warren watching their every move, Carter and Allison work together to halt the deadly deterioration of Eureka's atmosphere, but it falls to another couple to help save the day. Fargo and Holly must get past their issues to execute a daring, dangerous mission -- in the midst of a toxic snowstorm.
Episode 18 : This One Time At Space Camp
The Astraeus clock is ticking as the nervous candidates appear before Senator Wen (Ming-Na) for their final evaluations. One by one, each aspiring crew member is fitted with a memory reader to reveal their deeper motives. Warren Hughes (Wallace Shawn) uses the same device on Carter (Colin Ferguson) and Allison (Salli Richardson-Whitfield) as part of their appeal to his ruling against their relationship -- although he warns them not to expect a reversal of his decision. Many facts come to light in the Astraeus interviews. Senator Wen learns that Holly (Felicia Day) has been an over-achiever since birth, Zane (Niall Matter) learned to improvise -- not always legally -- as a lonely teen, Fargo (Neil Grayston) has always had more smarts than he's been given credit for, and Jo (Erica Cerra) is obsessive about rising to a challenge. A series of bizarre attacks around town threaten to derail the Astraeus mission, the acts all the more mysterious for appearing oddly familiar. When Carter realizes what is happening, he takes Henry (Joe Morton) on a hair-rising ride to save the life of the man who set out to destroy Carter and Allison's happiness.
Episode 19 : One Small Step...
While the Astraeus crew completes the final preparations for their mission, Carter (Colin Ferguson) and Taggart (Matt Frewer) try to find out who -- or what -- melted a cow belonging to a member of the crew. The issue grows in urgency when it becomes clear that the bovine is only the first victim. Has Dr. Parrish (Wil Wheaton), envious of the adventure that Fargo (Neil Grayston) and Holly (Felicia Day) are about to embark on, gone too far? After turning down her chance to be on the Astraeus, Jo (Erica Cerra) begins to question what she really wants from her life. Titan-bound Zane (Niall Matter) is less than sympathetic but Taggart understands her need to find her own place in the world. Meanwhile, seeing their friends preparing for months of separation from each other, Carter and Allison (Salli Richardson-Whitfield) contemplate the next level in their relationship. During a routine shipment of supplies to the Astraeus landing site, a malfunction of the FTL technology strands Deputy Andy (Kavan Smith) on Titan. The emergency strains the shared mission command of Henry (Joe Morton) and Grace (Tembi Locke). While everyone scrambles to bring Andy home before he succumbs to the poisonous environment, Henry begins to doubt the wisdom of the mission itself.
Episode 20 : One Giant Leap
With the Astraeus countdown underway, Carter (Colin Ferguson) hopes Allison (Salli Richardson-Whitfield) and Kevin (Trevor Jackson) will decide to move in with him. Personal issues get shelved when Carter and Jo (Erica Cerra) investigate a mysterious attack on the presidential convoy. Initial clues point to super-environmentalist Dr. Plotkin (Dave Foley), but when cosmic anomalies start popping up all over town, Plotkin's radical research looks like it might save the day. But not for long... At Global Dynamics, as Henry (Joe Morton) and Senator Wen (Ming-Na) oversee final launch preparations, Fargo (Neil Grayston) and Holly (Felicia Day) make some preparations of their own. Henry and Grace (Tembi Locke) exchange wistful goodbyes while Jo's farewell to Zane (Niall Matter) carries a deeper meaning he does not yet suspect. Carter and Plotkin quickly discover that their solution is only temporary and that Eureka faces certain annihilation. Their one hope is an insanely dangerous plan that puts Carter in the direct path of earth-shattering forces -- but neither he nor anyone else realizes that another threat, much worse, looms over the Astraeus mission and its crew.
Episode 21 : Do You See What I See?
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. The episode features a stellar line up of guest stars lending their voices to a variety of characters, including Emmy Award-winner Jim Parsons, Edward James Olmos, Chris Parnell and Matt Frewer.