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The Townsfolk of Eureka
Sheriff Jack Carter (Colin Ferguson)Jack Carter is a U.S. Marshal who reluctantly ends up as Sheriff of Eureka. Jack is consistently dumbfounded by the wonders Eureka produces, as well as its propensity to produce things that often threaten the entire town, if not the world. Despite being a man of average intelligence in a town full of geniuses, Jack's admittedly simplistic ideas and ability to make intuitive connections between seemingly disparate events often save the day. (This is in contrast to the other residents of Eureka, who, being stereotypical scientists, tend to over-complicate things and get lost in meantime).
- Belligerent Sexual Tension: With Allison for a few seasons. With Tess from the moment she shows up.
- Berserk Button: Threatening to harm Zoe or Allison, or anybody else he's close to will usually elicit this response.
- Big Brother Instinct: Towards Fargo, believe it or not. When things get their worst for the him, Jack is always there to help the little guy.
- Big Damn Heroes: He does it a lot, being a former U.S. Marshal helps.
- The Call Knows Where You Live
- Calling Me a Logarithm: With his barely-above-average intelligence and layman's grasp of physics, Jack frequently feels insulted when his genius friends throw around terms like "p-brane" and "smart asphalt".
- Chronic Hero Syndrome: Summed up perfectly in the finale, where he jumps through a wormhole in order to close it;Carter: This is what I do!
- The Chew Toy: Put through the wringer on a daily basis trying to clean up or fix the incredibly ludicrous ways Eureka's experiments go wrong.
- Cutting the Knot: Has a talent for finding the simplest way out of a problem, which the people of Eureka learn to value.
- Determinator: Oh so much.
- Heroic B.S.O.D.: When Grant started to mess up the timeline "again" Allison got Killed Off for Real, until Jack and Grant fixed it.
- Heterosexual Life-Partners: With Henry.
- Hidden Depths
- Impossibly High IQ: Averted. Jack's IQ is 111, which is on the high side of average, and perfectly consistent with his portrayal as Book Dumb but fairly clever.
- Leeroy Jenkins: What most if not all the townsfolk thought of him when he first took the job.
- Like Brother and Sister: He has this relationship with Jo. They get on each others nerves, love to watch the other suffer, and the thought of romantic interaction is both laughable and weird to them. But behind the snark, they're close friends.
- Made of Iron: Nothing, and I mean nothing is enough to keep him down for long.
- Nice Guy: He's generally heroic, selfless and tries to help out the rather difficult townspeople.
- Only Sane Man: In a company town full of MadScientists, it's the U.S. Marshal sheriff who has any common sense.
- Papa Wolf: Do not mess with Jack's daughter; he takes it very personally.
- Plot Armor: Lampshaded by Andy, who notes that the odds of survival are better when Jack's around.
- Red Oni, Blue Oni: Jack is red, usually against Allison or Henry's blue.
- Smarter Than You Look: Jack is not stupid. He's actually got a way of thinking that allows him to instantly identify the problem at hand. More often that not the scientific genii dismiss his initial idea, only to later to realise that it was the correct solution all along.
- Unlucky Everydude: In a town full of geniuses, he often thinks of himself as this. Stark never really helped in that regard.Stark: Yes he said invisibling.
- Unresolved Sexual Tension: With Allison,now it's been resolved.
- Will They or Won't They?: With Allison. They do.
Zoe Carter (Jordan Hinson)Jack's rebellious teenage daughter. Unlike her father, she is intelligent enough to keep up with the town's residents (her IQ is 157), yet like her father, possesses the street smarts most of the town's residents do not. She longs to be a medical doctor, and with the help of Henry's recommendation letter, receives an early acceptance to Harvard's medical program. She dates Lucas but in the altered timeline, they broke up when Lucas moved to Geneva, and she is now showing interest in Zane. She is also a bit more mature and responsible after her time at Harvard.
- Bratty Teenage Daughter: Eventually grows out of it and becomes closer to her father.
- Commuting on a Bus: Beginning with Season 4, thanks to early admittance to Harvard on a medical scholarship.
- Daddy's Girl: Despite the fact they often snark at each other, Zoe is very close to her dad.
- Deadpan Snarker
- Military Brat: More like Marshal brat or... you get the idea.
- Never My Fault: Said that a lot in the first few seasons, usually after she messed up badly.
- Non-Action Girl: Most of the time. As the series continued, she slips into Action Girl more - probably gets it from her father's side of the family.
- Non-Action Snarker: Man does she love to snark.
- Perky Goth: Had this style for the first two seasons.
- Reformed Criminal
- Single Woman Seeks Good Man: And always ends up with a teenaged crazy, go figure.
- Smarter Than You Look: Ridiculously so. She's able to hold her own academically in Eureka and hide her smarts from her dad.
Dr. Henry Deacon (Joe Morton)Henry is the town's jack-of-all-trades. Although, like most residents of Eureka, he is a brilliant multidisciplined scientist, Henry has ethical objections to the kind of research conducted at Global Dynamics, preferring employment as the town's mechanic. Henry's assistance is often invaluable in defusing the situations the experiments in town create. During Season 3, he was elected mayor as a write-in candidate. Following the change in timeline in season 4, he is suddenly married and is trying to keep the timeline shift a secret. Late into the 4th season, he confides in his "wife" after he realizes he is beginning to fall in love with her.
- Anti-Hero: For almost all of season 2.
- The Conscience: Always used to say that science should only be used for furthering mankind's understanding of the universe. Even after his Kim-related season 2 breakdown, he still champions responsible use of science.
- Despair Event Horizon: Kim's death.
- Fallen Hero: But only for one season, he snapped out of it in the end.
- Happily Married: To Grace.
- Non-Action Guy: Though he graduates to a full on action-guy quite a bit early on.
- Technobabble: But he's good at translating for Jack's sake.
Allison Blake (Salli Richardson-Whitfield)Allison is a Department of Defense agent who acts as the liaison between Eureka and the Federal Government, and later becomes the director of Global Dynamics. She is always at the forefront of any dilemma that might arise. Although she works for the DoD, she has two PhDs and an MD. Allison is also raising her son Kevin, an autistic youth whose father died when he was still a baby, and Jenna, the daughter she conceived with Nathan shortly before his death/disappearance. After the change in the timeline, Kevin is no longer autistic and she never became director of GD; she is, instead, head of GD's medical science division.
- Nice Girl: Kind-hearted and fairly patient, despite the other scientists quirks.
- Not So Above It All: She really seems to enjoy participating in Baseball games when she gets the chance.
- The Reliable One: Unlike most of the scientists in Eureka, she usually focuses on the problems and tries to keep things sane, rather than getting caught up in her own projects.
- Science Hero: Like most of the town, though particularly pronounced as director of G.D
- Team Mom: Especially to Zoe.
- Tsundere: Type B. She is unflappably courteous and kind to everyone she meets... except Nathan.
- Unresolved Sexual Tension: With Jack. They do.
- Will They or Won't They?: With Jack. They do.
- Workaholic: As Zoe comments, she's the kind of Type A bride to work on her wedding day.
Josefina "Jo" Lupo (Erica Cerra)A tough, no-nonsense cop with a love of firearms. After a brief fling with Taggart, she later develops a relationship with Zane. Zane proposes to her in the Season 4 premiere, but before she can answer him, time is altered to where the two of them never dated, and in fact cannot stand each other. In the new timeline, she is Head of Security at Global Dynamics, her role as deputy taken by the android Deputy Andy.
- A Mother To Her Men: It's not brought up often, but as head of GD security she has moments when she shows how much she cares about the men under her command. When some of them were critically injured during an episode she watched over them in the infirmary, stating "I've got four guys who can't be moved, so I can't be moved."
- Badass Adorable: Easily the most awesome in a fight and completely willing to hurt people.
- Beta Couple: to Jack and Allison, with Zane.
- Belligerent Sexual Tension: With Carter, Taggart, Zane, Zoe and even Fargo.
- Berserk Button: Just about anything can get Jo mad, and don't you dare call her by her full name...
- Brainy Brunette: Behind her badass attitude is just another genius.
- Crack Pairing: With Taggart. At least, that's how it's treated initially. Later it's treated as just another romance in a wacky town.
- Geeky Turn-On: When everyone starts sharing dreams in season 1, it turns out the Zorro dream was actually hers, leaving Jo naturally horrified that on some level, she's actually secretly attracted to Fargo!
- Hidden Depths: She's a Lady of War, but she still likes girly things like dancing and Cosmo, though she hides both.
- Leaving You to Find Myself: She pulls one of these on Zane, after falling back into a relationship with him after the time line shift. She goes on a spirit walk instead of joining him on the mission to Titan.
- Lady of War: And a very scary lady of war she is at that.
- Like Brother and Sister: She has this relationship with Jack. They get on each others nerves, love to watch the other suffer, and the thought of romantic interaction is both laughable and weird to them. But behind the snark, they're close friends.
- Love at First Sight: Well, at least infatuation at first sight with Taggart.
- No Guy Wants an Amazon: It's not easy for a badass lady like her to find a boyfriend.
- Tragic Keepsake: After the timeline changes, Jo keeps the engagement ring that the original Zane proposed to her with, as a reminder of their relationship, seeing as in this reality, they never dated and don't even like each other.
- Tsundere: Towards Zane, and most characters for that matter. She's mostly a badass Tsuntsun, but once she gets close to someone she softens up slightly. If those people are hurt in anyway though, her Dere side comes out and she is very soft spoken and caring.
- When She Smiles: It makes you want to smile with her.
- Will They or Won't They?: With Zane after their relationship is erased. It clear she still loves him, and he is attracted to her, but she is unwilling to rekindle their romance, and he doesn't even know there is was any relationship to rekindle in the first place.
- Working with the Ex: Has to work very closely with Zane after their relationship is erased from reality. Of course she is the only one of them who remembers this relationship.
- Wrench Wench: Not a mechanic but, she knows how to assemble and disassemble her weapons in a snap.
Dr. Douglas Fargo (Neil Grayston)A junior scientist who's always been treated dismissively by his peers. Accident prone, he more often than not ends up a victim of the disasters befalling the town. He has also caused a fair share of the problems. Neil Grayston also provides the voice of S.A.R.A.H. (Self Actuated Residential Automated Habitat), the bunker home Jack and Zoe live in. In the alternate timeline, he is head of GD, and not well liked by the staff because of his alternate's imposing and intimidating manner. He has difficulty in this new role as his alternate was a domineering egomaniac, an act he has trouble pulling off. Even so, the job has begun to transform him into a more decisive and capable leader as the weight of responsibility has forced him to stand up to other GD employees, the Department of Defense, and military generals.
- Badass Bookworm: What he becomes when he really puts his mind to it.
- Bumbling Sidekick: To Stark originaly, though he is getting a little better.
- Butt-Monkey: His face should be on the tropes page.
- Clueless Chick Magnet: He's actually had many a pretty little lady after him.
- Crouching Moron, Hidden Badass: In the second half of the fourth season, Fargo starts to step up to his role as head of Global Dynamics and even manages to improvise his way out of an inadvertent death trap when he and Zane end up in a launched rocket with no controls or communications.
- Fish out of Water: Everywhere he goes.
- Heroes Want Redheads: Has had romantic interest in red headed Claudia and Holly
- Hidden Depths: He doesn't always do the sensible thing, he always wants to do the right thing.Stark: I knew you had it in you, Fargo.Fargo: I didn't.
- Naïve Newcomer: Newcomer, no. Naive, YES!
- Plucky Comic Relief: Who isn't in this show, other than Stark?
- The Smart Guy: But that's to be expected.
- Sharp Dressed Man: He wears a suit like Stark's in the new timeline.
- Undying Loyalty: To Stark. This is one of the things about him, which is strange considering the fact that Stark's always been a jerk towards him.
- What Does This Button Do?: Frequently. His GD personnel file contains the phrase 'inappropriately pushed button' 37 times.
Dr. Nathan Stark (Ed Quinn)One of Eureka's top scientists. He and Jack are frequently at odds, though both respect each other. He is formerly married to Allison, and they rekindled their relationship in the second season. They were supposed to get remarried in the third season, but he dematerializes while saving the world from a time paradox on the day of their wedding, an event that apparently still occurred in Season 4's alternate timeline.
- Big Brother Worship: From Fargo.
- For Science!: That's his justification for some of the things he does and what he allows some of the other scientists to get away with.
- Gone Horribly Right: His research into the Artifact.
- Heroic Sacrifice: Saved the universe knowing full well it would cost him his life. On the day of his wedding. In fact, at the moment he should have been saying his vows.
- Killed Off for Real: Or, displaced in time for real. Don't really know for sure.
- Mad Scientist: And unlike just about all the other scientists in Eureka, not in a very nice way.
- Meaningful Name: He's named after Tony Stark of all people.
- Morally Ambiguous Doctorate: Though not really evil, just morally ambiguous... really really ambiguous.
- Spirit Advisor: After his death, he sometimes appears to Jack and helps him work through the day's problems. Or not, depending on his and/or Jack's mood.
Zane Donovan (Niall Matter)A rebellious genius, recruited in the second season as an alternative to imprisonment after being arrested for fraud (allegedly causing the New York Stock Exchange to crash). He also develops a relationship with Jo Lupo shortly after his arrival in Eureka. However, this relationship is erased with the change in timeline. He is back to being a perpetual prankster and a low-level nemesis of Jo, though he shows signs of improving because of the trust she puts in him.
- The Atoner: He's started to think of his new job in Eureka as a chance for this.
- Beta Couple: His relationship with Jo is this to Allison and Jack
- Dark and Troubled Past: Former felon, that kinda says it all.
- Heroic Comedic Sociopath: Though not evil at all, just an ass.
- Heel–Face Turn: Started out as a Jerk Ass dragalong in Eureka but eventually grows into someone who genuinely wants to be there. Time-travel-related shenanigans has the effect of undoing all of it, at first.
- Hidden Depths: He actually can be sensitive once in a while.
- Manipulative Bastard: In his debut episode especially, he brilliantly plays peoples egos and personal weaknesses to get him information and access to the tech in the sheriffs station.
- Technical Pacifist: He is a jerk yes, but he doesn't like to actually hurt anybody.
- Will They or Won't They?: With Jo in seasons 4 and 5. He's clearly attracted the her but she has already been in a relationship with him in the original timeline, and doesn't want to get hurt again. He doesn't know any of this or course.
Dr. Jim Taggart (Matt Frewer)Taggart is a somewhat eccentric animal expert. He also does work in geophysics.
- BFG: All non-lethal of course, but still... he has quite a few.
- CloudCuckoolander: Even the other townsfolk of Eureka think he's weird, what's that tell you?
- The Cuckoolander Was Right: Most of the time his theories are to bizarre to be true, other times...
- Insistent Terminology: Taggart is not the town's dogcatcher. He is a Biological Containment Specialist.
- Genius Bruiser: While not refined he is just as well educated as anybody else in Eureka, which means he's a genius of course. He's also an impressive judge of character, and a cunning tracker.
- Nice Hat: He sports a few of these.
Dr. Holly Martin (Felicia Day)Holly is a Rocket Scientist and Fargo's love interest in Seasons 4 and 5.
- Adorkable: Double whammy, as the character is adorkable, as is the actress who plays her, the geek goddess Felicia Day.
- Artificial Human: Near the end of the series, she's the uploaded mind of a person, running on a "photonic processor" in a bio-printed replica of her original body. Other than that, she's indistinguishable physically from any other person.
- Brain Uploading: As part of the 'matrix' plotline she is uploaded along with the rest of the crew.
- Character Death: As part of the Astraeus 'matrix' plotline she discovers the truth about the machine and is killed to prevent her from exposing it to the other crewmembers, though she was eventually brought Back from the Dead.
- Geeky Turn-On: Is this for Fargo.
- Really Gets Around: She prefers to deal with unresolved sexual tension by resolving it, and claims that while she's awkward with the more social aspects of relationships, she's really good at sex. "This One Time At Space Camp" reveals that one of her previous conquests was Fargo's nemesis at Galaxy Camp.
- Sacrificial Lion: As part of the fifth season's Darker and Edgier turn.
- She Knows Too Much: When she figures out the crew of the Astraeus are trapped in a Lotus-Eater Machine she is immediately killed by Senator Wen.
Trevor Grant (James Callis)An associate of Albert Einstein and one of the founding members of Eureka. In the original timeline the Einstein-Rosen Bridge is called the Einstein-Grant Bridge after him. He time-travels to the present with the main characters, resulting in the new timeline. He returns in the series finale to buy GD after it loses government funding, saving Eureka.
- The Rival: To Carter for Allison's affections.
Grace Monroe (Tembi Locke)Henry Deacon's wife in the new timeline. She is later revealed to have been a Consortium spy recruited by the new timeline's Henry. However, she'd stopped long before she was arrested.
- Heel–Face Turn: Offscreen, she and other timeline Henry abandoned the Consortium together.
Vincent (Chris Gauthier)The owner of Cafe Diem, a local restaurant. Vincent's restaurant has no menus as he is able to make anything that a customer orders. He is another one of Eureka's resident geniuses, having a doctorate in molecular gastronomy.
- Ambiguously Gay: The show did not confirm, explore, dramatise or in any way reference his sexuality.
- As of the series finale it doesn't seem so ambiguous any more, to judge from his reaction to naked Parrish.
- Bigger on the Inside: Vincent's pantry, which is what allows him to cook so many different dishes.
- No Name Given: His last name is never revealed.
- Supreme Chef: As mentioned, Cafe Diem doesn't have a menu, because Vincent can make anything the customer asks for.
Isaac Parrish (Wil Wheaton)Head of Eureka's Non-Lethal Weapons department.
- Expy: He's very similar to the Larry Haberman of the original timeline.
- Inferiority Superiority Complex: Looks down on Fargo for being a "legacy", while at the same time having an almost pathological need to one up him at every turn.
- The Rival: To Fargo, ever since childhood. He is the most critical of Fargo's time as the head of GD. He is also his chief rival for Holly's affection.
Larry Haberman (Christopher Jacot)A GD employee.
- Butt-Monkey: Perhaps the only character to be more of one than Fargo. (Not terribly surprising, since Larry is essentially Fargo minus the sympathetic qualities.)
- Phrase Catcher: "Shut up, Larry!"
- The Rival: In the original timeline
- Professional Butt-Kisser: To Fargo as he is his personal assistant in the new timeline.
Kevin Blake (Meshach Peters, Trevor Jackson)Alison Blake's teen son. Autistic in the original timeline, a normal teen in the new one (albeit with the same genius intellect as before).
- Alternate Timeline: His previous version is responsible for creating one; unlike most versions of the trope, this timeline actually remains.
- Kid Hero: Not enough to legally drive, has helped save the town a few times.
- Hollywood Autism: Subverted.
- The Rainman: Played with; Kevin is a genius in both timelines, but it's only in the second timeline that he can communicate the fact clearly.
- Teen Genius: Able to create a way to detect theoretical phenomena in less then a month. Also able to create a serum on the fly to turn your average Joe into a genius among geniuses. When polymath Henry Deacon is stunned by your intellect, then you have one of the smartest persons in Eureka if not the world.
Dr. Beverly Barlowe (Debrah Farentino)Beverly was the town psychiatrist. She secretly works for a mysterious organization known as "the Consortium", which has expressed a desire to exploit Eureka's innovations by whatever means necessary. A primary villain in Seasons 1 and 2, she is absent for all of season 3 but returns in the Season 4 Episode "Stoned" and meets with Dr. Trevor Grant in a clandestine meeting where she reveals her connection to him and his secret plans in 1947, thereby luring him into cooperating with her and her organization. She escapes capture when her plot is foiled.
- Added Alliterative Appeal: Welcome to Beverly Barlowe's Bed and Breakfast.
- Bitch in Sheep's Clothing
- Even Evil Has Standards: Surprisingly, the new timeline's Beverly is quite opposed to Senator Wen murdering Holly for figuring out the nature of the Lotus-Eater Machine she's trapped in. So much so, in fact, that she apparently makes a Heel–Face Turn in the next episode.
- Evil Redhead: Red hair. Evil as they come.
The ConsortiumPrimary villains in Eureka. An organization, out to prevent "things mankind is not yet ready to use" from being misused. Of course they are the ones who get to decide who uses what, and to what end. The Consortium has existed for a very long time. Almost nothing is known about them, except for the fanaticism to their purpose.
- Kick the Dog: Kills plenty of people when it's not necessary to their mission, including Mrs. Perkins and poor Kim and Holly.
General Mansfield (Barclay Hope)The liaison between Global Dynamics and the Department of Defense.
- The Cavalry: Whenever a big enough disaster threatens Eureka, he'll be called in to help out.
- The Ghost: After Season 4, he is mentioned several times but never appears.