Episodes

1. 

   Episode 1

   Founders Day

   Eureka is abuzz with geniuses celebrating the anniversary of the founding of their town. Henry, repairing the Founders Car, gets some help from a new acquaintance named Grace; Allison is struggling with the challenges of caring for a toddler and an autistic teenager; Carter isn’t looking forward to the big party – his recent breakup with Tess still stings; Kevin tinkers with a mysterious machine and Zane proposes to Jo, who panics in the moment of tenderness.

2. Episode 2

   A New World

   Carter, arriving home from 1947, is surprised to find Tess at his house, happy and in love with him, when Kevin walks in, talking and independent. Jo is less lucky in love – Zane wants nothing to do with her. Henry, meanwhile, discovers he’s mayor of Eureka.

3. Episode 3

   All the Rage

   Fargo is dealing with his new reputation as a tyrant, as well as the pressure of answering to General Mansfield, who’s demanding progress on a non-lethal weapons project. He and Jo head to the lab for a report, where they learn about a web-shooting device called an i-mine and a beam designed to pacify large crowds.

4. Episode 4

   The Story of O2

   It’s space week in Eureka, and everyone is gearing up for the rocket race – except for Carter. He’s getting ready to visit Zoe, and is a little apprehensive of any changes that may have happened because of the time travel.

5. Episode 5

   Momstrocity

   As Carter prepares for a camping trip with Henry and Fargo, Kevin’s homework assignment, an emotionally intelligent robot called Emo, is kicking up trouble and spying on Jo in the shower. Andy arrives at Carter’s house in response to a call, but as Andy seems to be mistaken, Sarah asks to check his circuits. Carter checks in on Allison and offers to take Kevin on the trip, so they can talk about the morning’s Emo episode. Henry backs out of the trip, saying he wants to spend time with Grace, but encourages Carter to go for what he wants – a relationship with Allison.

6. Episode 6

   Stoned

   Zoe is back in town, and everybody wants to catch up with her, including Zane, much to Jo and Carter’s dismay. But Carter’s woes don’t stop there, Grant is putting the moves on Allison, so Carter finally steps up and asks her out. Jo, meanwhile, is furious after a paleontologist named Derek shuts down construction on her new home due to a scientific find: the pinky bone of an early hominid. Fargo calls Jo for emergency help: someone’s onto the fact that Grant has a fake personnel file. They have no choice but to ask Zane for help figuring out who knows what. Zane agrees to help and discovers that it’s the IRS making his life difficult, but when Grant receives a mysterious gift asking for a secret meeting, he discovers it’s someone much more serious.

7. Episode 7

   Crossing Over

   Henry and Grant have their first successful engine test with the bridge device, but when Grace enters, Grant leaves the married couple to do their own celebrating. Henry gets cold feet though, and leaves Grace perplexed. Carter has his own love woes; Allison is being wooed by Grant. But everything’s rosy for Fargo, who has prepared an entire day for the visit of Claudia Donovan, an official from Warehouse 13, who’s in town to pick up the neutralising goo upon which her organisation depends. Just as she’s noting how normal Eureka seems, giant redwoods sprout up, fully grown, in the center of GD headquarters. Claudia stays to help unravel the mystery.

8. Episode 8

   The Ex-Files

   Grace and Henry have a party to celebrate their union. Grace has adapted a PTSD therapy to allow the two of them to share memories and rebuild their relationship. Grant shows up late, coming from a visit with Beverly Barlowe, who waited decades to ask him for his help. He's troubled by her news that the DED, which is a dangerous weapon with the power to nullify all electronics in a country that is being developed at GD. In true Eureka style, the machine malfunctions, and the General is furious.

9. Episode 9

   I’ll Be Seeing You

   Carter and Allison's afterglow is interrupted by the continuing search for the DED device. At GD Henry discovers an anomaly in the fact that there's an area emitting no radiation—a natural impossibility. As he and Allison trace the source, Zane tells the others that he thinks Grant is behind the theft. To be on the safe side, Jo pulls Grant's original file from 1947 and she and Carter find some interesting items. They discover an audio recording Grant made regarding Carter in 1947, as well as a police report of the arrest of Beverly's father after he stole the plans for the bridge device. Carter realises that if Beverly is involved, Allison and Henry are in danger. He rushes away and reaches them just as they discover a gorge where there used to be a plain.