Episode list

Several weeks have passed since their epic defeat of Gabe, and Cat and Vincent are finally able to begin a new, "normal" stage in their lives. Unfortunately, "normal" isn't in the books for him, as confirmed by the two FBI Agents trying to recruit him.

Vincent and Cat deal with their rapidly changing relationship when they move in together.

When two married Homeland Security agents take over an investigation, Cat and Vincent bond with them.

Cat and Vincent take their relationship to a couples counselor when Cat dives into her work and suspects a wealthy transplant recipient of being involved with the mysterious experiments on innocent people in the city.

Cat receives a new partner assignment, causing her to think that Carol and Bob have returned; J.T.'s healing ability comes at a terrible cost.

JT throws Vincent a surprise bachelor party. Unfortunately, it is interrupted by a mysterious sniper with his sights set on putting a stop to Vincent and Cat's interference with the super human experiments. Cat's family comes to town for a bridal shower arranged by Heather but Cat is distracted by having to visit her imprisoned father to ask for his help.

When an unstoppable assassin hunts down Cat and Vincent, they attempt to lure him out of town and away from their loved ones with the ruse that they plan to elope. Meanwhile, tired of being under police protection, JT asks Tess to help him track down a lead while a distracted Heather attempts to focus at her new job.

Cat and Vincent approach their wedding day; Vincent JT and Tess do all they can to keep a worried Cat focused on her big day.

After a powerful force ruins Cat and Vincent's wedding day, everyone must band together to remind Cat of her greater purpose.

Catherine and Vincent find information about "Patient X", the patient with the serum who Julianna was protecting, that could help them find Liam Cullen. Tess keeps moving J.T. to make sure he is not tracked by Liam.

In a surprising turn of events, Vincent agrees to help Liam on a mission to retrieve evidence that could expose them both. Meanwhile, a suspicious Cat discovers something about Liam's family history and must warn Vincent before it is too late.

Liam's shocking history makes Cat delve deeper into the Ellingsworth family, where she learns of their tragic past. Vincent and Cat realize that they will need to use their secret weapon if they want to take Liam down. Meanwhile, JT has a theory about how to save himself but it involves none other than Liam.

Catherine and Vincent must work together to defeat Liam, who will do whatever it takes to expose Vincent as a beast.