Carter is uncomfortable with Tess moving in with him. Meanwhile, Fargo has trouble coping with being director of Global Dynamics. After witnessing a malfunctioning demonstration in the non-lethal weapons lab, everybody inside Global Dynamics start showing signs of rage before they are no longer lucid. The only ones who are not infected are Allison, Carter and Tess, who were not in Global Dynamics at the time. Lupo helps them find a solution before she too is no longer lucid, in which case she cuffs herself.
Eventually, using Fargo as a diversion, Tess is able to correct the malfunction, causing everybody in the building to return to normal. In the end, Carter confronts Tess about how uncomfortable he is with her moving in with him, and feels it would be best to split up. Deacon and Grant work on repairing the space-time bridge. However, in the process everything they touch disintegrates. Deacon soon learns that Grace played a prank on him.
original airdate-July 23,2010 rating-2.29 million
song--Eureka Theme song--"Eureka On My Mind" by Bear McCreary