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- Season 4 overviewJul 9, 2010-Dec 6, 201121 episodesSeason 4 episodes1. Founder's Day Jul 9, 2010
- Carter and friends are transported to a dangerous military installation.
- 2. A New World Jul 16, 2010
- Carter and his travelers realize the startling implications of their return to Eureka.
- 3. All the Rage Jul 23, 2010
- Blind rage infects everyone at Global Dynamics with catastrophic results.
- 4. The Story of O2 Jul 30, 2010
- Allison deals with trouble during Eureka's space week festival.
- 5. Crossing Over Aug 6, 2010
- Claudia Donovan visits Eureka to check the validity of Fargo's promises.
- 6. Momstrosity Aug 13, 2010
- Tiny escapes and finds Jack and Kevin camping with Fargo and Grant.
- 7. Stoned Aug 20, 2010
- Carter and Zoe find Thurgood encased in stone; Allison tries to cure Thurgood.
- 8. The Ex-Files Aug 27, 2010
- Eureka's citizens face the return of people from the past; Global Dynamics tests a new device.
- 9. I'll Be Seeing You Sep 10, 2010
- Global Dynamics project is stolen; Grant is the prime suspect.
- 10. O Little Town Dec 7, 2010
- Carter's plans to visit family for the holidays are thwarted.
- 11. Liftoff Jul 11, 2011
- Relationships are tested and a rescue effort begins when Zane and Fargo are launched into space.
- 12. Reprise Jul 18, 2011
- Fargo demonstrates the FTL device and Holly disappears causing a stir.
- 13. Glimpse Jul 25, 2011
- Scientists compete to be on the Astraeus mission crew for the trip to Titan.
- 14. Up in the Air Aug 1, 2011
- Carter must solve a bank robbery before the town floats away; Allison struggles with lost time.
- 15. Omega Girls Aug 8, 2011
- Jo and Zoe need to stop Beverly before she is able to complete her plan.
- 16. Of Mites and Men Aug 15, 2011
- Disaster abounds while the Astraeus candidates are in isolation.
- 17. Clash of the Titans Aug 22, 2011
- The Eureka atmosphere becomes toxic when Department of Defense auditor comes.
- 18. This One Time at Space Camp... Aug 29, 2011
- The candidates' final interviews and the results of the relationship audit.
- 19. One Small Step Sep 12, 2011
- Grace embraces an honor that puts a burden on her bond with Henry. Deputy Andy becomes a guinea pig.
- 20. One Giant Leap Sep 19, 2011
- Carter must fight off a plague of destructive objects; a development threatens the Astraeus ship.
- 21. Do You See What I See Dec 6, 2011
- A mysterious wave of color collides into Eureka, causing the entire town to become animated.