E1 - Pilot

Aired: July 18, 2006

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.

E2 - Many Happy Returns

Aired: July 25, 2006

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.

E3 - Before I Forget

Aired: August 01, 2006

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

E4 - Alienated

Aired: August 08, 2006

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...

E5 - Invincible

Aired: August 15, 2006

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

E6 - Dr. Nobel

Aired: August 22, 2006

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.

E7 - Blink

Aired: August 29, 2006

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

E8 - Right as Raynes

Aired: September 05, 2006

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

E9 - Primal

Aired: September 12, 2006

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

E10 - Purple Haze

Aired: September 19, 2006

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.

E11 - H.O.U.S.E. Rules

Aired: September 26, 2006

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.

E12 - Once in a Lifetime

Aired: October 03, 2006

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.