Season 4
The fourth season of the fantasy series set in the quirky and seemingly perfect small town of Eureka, where the hidden work of America's brightest scientists can lead to innovation or utter chaos.
Episodes
1 Founder's Day Jul 9, 2010 
2 A New World Jul 16, 2010 
3 All the Rage Jul 23, 2010 
4 The Story of O2 Jul 30, 2010 
5 Crossing Over Aug 6, 2010 
6 Momstrosity Aug 13, 2010 
7 Stoned Aug 20, 2010 
8 The Ex-Files Aug 27, 2010 
9 I'll Be Seeing You Sep 10, 2010 
10 O Little Town Dec 7, 2010 
11 Lift Off Jul 11, 2011 
12 Reprise Jul 18, 2011 
13 Glimpse Jul 25, 2011 
14 Up in the Air Aug 1, 2011 
15 Omega Girls Aug 8, 2011 
16 Of Mites and Men Aug 15, 2011 
17 Clash of the Titans Aug 22, 2011 
18 This One Time at Space Camp... Aug 29, 2011 
19 One Small Step... Sep 12, 2011 
20 One Giant Leap... Sep 19, 2011 
21 Do You See What I See Dec 6, 2011