In the fourth-season finale, Sheila learns that Jimmy’s ghost has been spotted on several occasions, so she investigates. Meanwhile, Colleen blames Tommy for her failed relationship; Franco and Natalie come to an understanding, as do Lou, Cousin Mike and Latrina; and Tommy spends time with his father.
Zoe and her friends lose their voices, but whatever is causing the symptoms has an even worse effect on Allison and her only hope comes from an unusual source.
Meghan and Diana learn how to remove the entity from Tom, but the procedure is dangerous.
Meanwhile, Shawn finds help in his attempt to rescue Kevin from Promise City; and Jordan is betrayed by someone close.
Tommy plays hero in someone else’s uniform, confusing the crew; Colleen finds a new reason to get upset with Tommy; Natalie asks Franco for a favor; a rift between Mike and Black Shawn nearly leads to blows; and Tommy makes a move on the chief’s daughter. This does not please the chief.
Strange happenings and spreading radiation at Global Dynamics lead to speculations that an abandoned research project concerning invisibility might have been revived. When Sheriff Carter accidentally becomes involved, the effects of invisibility threaten his life.
Kyle breaks quarantine to find Jessi and they use the photo from Baylin’s lock box to search for answers. Meanwhile, the Trager’s sort through all that they know about Kyle in order to make sense of who he really is.
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.
Once upon a time, there was a man named Jack who loved nothing more than cooking up a delicious meal for his loved ones. One day, he decided to prepare his famous burgers and fries for his family. He spent hours in the kitchen, carefully selecting the freshest ingredients and crafting each burger with love and care.
