Tommy goes on another memorable date with Beth for the sake of the crew; Black Shawn proves himself in an unexpected arena; Franco realizes what he’s really lost while Latrina shows she knows how to keep Lou happy; Dad gives Tommy some insight into his childhood
An experiment about the big bang theory seems to be the cause for Eureka’s finest to become dumber and dumber, including everyone involved in the experiment. When it comes to the verge of destroying Global Dynamics, the fate of the town lies in the hands of Jack Carter and the team of scientists he assembles, amongst them the newest member of the town, an anti-social genius.
An out-of-control and missing Jessi increases tensions within the Trager household, forcing Nicole to institute precautionary measures.
Tom and Diana must race to find the source of a computer virus that could bring down Ubient software, one of the world’s largest software companies that is run by suspected member of the marked, Drew Imroth. Meanwhile, Maia visits Promise City where she receives an unexpected birthday surprise: a visit from her birth parents.
The Gavin family AA group’s first meeting doesn’t go exactly as planned. Tommy bribes Colleen for information on Janet. Franco learns the truth about Natalie from Richie while Lou contemplates revenge on Cousin Mike.
A man who turns out to be Fargo’s grandfather has been cryogenically frozen for 50 years. He is awakened from his slumber by accident with no recollection of how he was frozen. In addition to that, it seems that he is the father of lots of technologies at Eureka.
After finding a photo of himself and Jessi locked in Baylin’s box, Kyle and Declan realize that the best way to crack the mystery of Jessi is to get close to her is at the high school charity event. Once there, Kyle uses the opportunity to talk to the already vulnerable Jessi. Meanwhile, other secrets are revealed during the event as Lori finds out the identity of her attacker.
Tom and Diana look for Richard, but Tom is distracted by his dreams about the future.
Meanwhile, Collier is threatened by Shawn’s test that could determine who would die from a Promicin shot.
The Gavin clan stages an intervention after several disturbing family calls; the mysterious woman (Gina Gershon) from the restaurant leaves Tommy wanting more; Janet must take matters into her own hands to get her baby back; and a depressed Mike calls Tommy in a moment of despair
A toxic spill seems to cause Eureka’s residents to share their dreams. Initially the situation is amusing, but turns dire after the dream sharing is discovered to have a lethal attribute. The situation becomes more complicated, when Carter finds out that the spill is not the cause.