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.