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Season guide

Eureka: Season 3

18 episodes Premiered Jul 29, 2008 Updated Oct 13, 2026

The third season of the fantasy and sci-fi series Eureka continues the narrative set in the quirky, seemingly perfect small town located in the Pacific Northwest. Eureka serves as a remote, cozy little Northwestern town where America's brightest minds and best minds have been secretly tucked away by the government to build futuristic inventions. As the series progresses, the hidden work of these brilliant scientists

Previously on Eureka

Season 3 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Eureka is a remote and cozy small town hidden away in the Pacific Northwest.
  • ⚡ The town is inhabited by America's brightest scientists who are secretly gathered to build futuristic inventions for the government.
  • ⚡ The secret work conducted by the scientists frequently leads to disastrously wrong outcomes, resulting in chaos alongside innovation.
  • ⚡ A United States Marshal serves as the sheriff of the town.
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Season overview

The third season of the fantasy and sci-fi series Eureka continues the narrative set in the quirky, seemingly perfect small town located in the Pacific Northwest. Eureka serves as a remote, cozy little Northwestern town where America's brightest minds and best minds have been secretly tucked away by the government to build futuristic inventions. As the series progresses, the hidden work of these brilliant scientists frequently leads to either groundbreaking innovation or utter chaos, with experiments and inventions often going disastrously wrong.

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Season 3 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 3 Progress Shield

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Binge Efficiency Engine

Season 3: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

17%
83%
Mytharc (3): Crucial lore & season climaxes
Core (15): Character development & subplots
Side Quest (0): Standalone / filler
S3·E1 Mytharc

Bad to the Drone

Jul 29, 2008 · 44 min

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

S3·E2 Core

What About Bob?

Aug 5, 2008 · 44 min

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

S3·E3 Core

Best in Faux

Aug 12, 2008 · 44 min

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

S3·E4 Core

I Do Over

Aug 19, 2008 · 44 min

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.

S3·E5 Core

Show Me the Mummy

Aug 26, 2008 · 44 min

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

S3·E6 Core

Phased and Confused

Sep 9, 2008 · 43 min

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.

S3·E7 Core

Here Come the Suns

Sep 16, 2008 · 43 min

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

S3·E8 Core

From Fear to Eternity

Sep 23, 2008 · 44 min

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.

S3·E9 Core

Welcome Back Carter

Jul 10, 2009 · 44 min

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

S3·E10 Core

Your Face Or Mine

Jul 17, 2009 · 44 min

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

S3·E11 Core

Insane In The P-Brane

Jul 24, 2009 · 44 min

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

S3·E12 Core

It's Not Easy Being Green

Jul 31, 2009 · 44 min

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

S3·E13 Core

If You Build It...

Aug 7, 2009 · 44 min

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.

S3·E14 Core

Ship Happens

Aug 14, 2009 · 44 min

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

S3·E15 Core

Shower the People

Aug 21, 2009 · 44 min

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.

S3·E16 Core

You Don't Know Jack

Aug 28, 2009 · 43 min

Global Dynamics sonic cleaning coincides with a phenomenon in which the citizens of Eureka develop a form of amnesia. Meanwhile, Allison goes into labor.

S3·E17 Mytharc

Have an Ice Day

Sep 11, 2009 · 44 min

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.

S3·E18 Mytharc

What Goes Around Comes Around

Sep 18, 2009 · 44 min

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.

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