Zoe prepares to leave for college; Tess receives a job offer in Australia; a magnetic disturbance hovers above Eureka.





Tess hopes her first day in charge of Global will be uneventful; the arrival of an Arctic ice core brings a new Ice Age to Eureka.





People from their past haunt Carter and Co, upsetting the balance in Eureka.





Zoe returns for a visit but the fun is cut short when people start to turn into stone. Meanwhile, the truth about Dr. Grant’s past is put into jeopardy when the identity Fargo constructed for him draws attention.





All the intelligent AI in town begins to behave strangely as Sheriff Carter, Fargo, Dr. Grant, and Kevin go on a camping trip. They are soon attacked by a rogue Titan rover unit which has developed parental feelings over Kevin’s school project, a tiny emotional robot. Meanwhile, Henry reveals to Grace about his time travel, and breaks up with her.





This is a Crossover episode with Warehouse 13. Claudia Donovan is invited to Eureka, where she hopes to find all the coolest new technology. But instead of new technology, she finds that objects are randomly teleporting into the town, apparently from 1947.



Alternate Stream



Eureka’s Space Week begins normally enough, with everyone caught up in a rocket race to the moon and back. But when the town somehow becomes over-oxygenated (and very combustible), the returning rockets could blow up the town.



Alternate Stream



Blind rage infects everyone at Global Dynamics with catastrophic results, and Carter makes a tough choice.





As the Founders’ Day festivities continue, Carter and the others must accustom themselves to the new time line and how Dr. Grant fits into it. Unfortunately, re-acclimatization needs to occur on a steep learning curve “Tiny”, one of Global Dynamic’s projects, has run amok in the crowded town.





Five people (Sheriff Carter, Deputy Lupo, Dr. Blake, Dr. Deacon, and Dr. Fargo) time travel to the late 1940s because of a space-time bridge created by an invention supposedly invented by Albert Einstein, which is on the street during the town’s founders day Celebration, and the same machine which is later found in the past in Einstein’s office. While some people in the past believe the newcomers to be spies, an associate of Einstein’s (Dr. Trevor Grant) believes them when Sheriff Carter and Dr. Deacon reveal they are from the future. Using transistors and their cell phones, they manage to recreate the bridge and bring themselves back to the present. Upon returning, Dr. Fargo realizes that the Archimedes statue in the town square is now bronze, and it was granite before they left. They each run home and find that there have been some changes in their home lives. Jo returns to the Police stations and finds Zane in a cell, Zane is still under arrest and never dated Jo. Allison rushes home to find her son is autistic free. Henry goes to his garage and finds out that he’s married to a woman name Grace. Finally Jack finds that he and Tess are now living together and the relationship is going strong. Finally, Dr. Trevor Grant walks into Cafe Diem asking for Allison revealing he was accidentally sent to the future as well.