Vincent kidnaps Cat as she tries to learn more about his mission; J.T., Tess and Gabe work together to help Cat.

Catherine and Vincent track a mysterious beast while keeping their individual agendas from one another in a clever game of cat-and-mouse. Meanwhile, Heather has a bombshell revelation for Cat, and Tess confronts Gabe about his real motives for helping Cat.

After getting stonewalled by Cat in his quest to track down a suspected beast, Gabe enlists Vincent's help, but Vincent quickly takes matters into his own hands. Unfortunately, the beast as an advantage over Vincent that requires Cat's help, in addition to the help of someone else who opens up old wounds from Vincent's past.

Cat uncovers more of her past than she anticipated at her high school reunion; Vincent reunites with a military friend who has a dangerous secret.

Cat confronts her birth father about the mysterious role he's played in her life, while Vincent has to neutralize a high-profile beast. In the process of doing so, Vincent finds himself rescuing Tori, a damsel in distress, who may be the key to completing his mission.

In an attempt to find out who Vincent's handler is, Cat enlists in the help of her father and invites Vincent to Thanksgiving dinner, which ends in disaster.

Vincent and Cat find themselves at odds on how to deal with Agent Reynolds, which forces Vincent to wonder if he is more beast than man. Cat makes a drastic move that will forever change her relationship with Vincent.

In order to prevent Vincent from further injuries, Cat helps protect Tori when her life is threatened, revealing a new, unexpected mystery. Meanwhile, Vincent's stubborn attempt to intervene leads to life-changing consequences, which causes Gabe and Cat to grow closer.

Vincent goes on a national talk show to reveal he is still alive, while Cat dives into an undercover case for FBI Agent Dana Landon. Vincent, determined to learn more about his beastly origins, ends up coming face-to-face with Cat in the middle of a heist, which forces them to work together.

A group of criminals looking to steal a rare necklace in Tori's possession takes Cat, Tori and Tess hostage at the precinct, leaving Vincent as their only hope for help. Vincent is forced to make a decision since helping could reveal his true identity to the entire force.

Cat and Vincent must work together to save J.T. when he gets kidnapped, while Tori attempts to intervene, with fatal consequences. Meanwhile, a stranger from FBI Agent Dana Landon's past is rescued along with J.T., and might have some insight about Vincent's beastly past.

Nel tentativo di rintracciare il rapitore di Sam, Vincent e Cat si trovano di nuovo a lavorare insieme, ma questa volta nel giorno di San Valentino.

Quando alcuni conoscenti di Gabe risultano dispersi, Cat e Vincent devono, ancora una volta, lavorare insieme, simulando la morte di Gabe. Vincent torna all'ospedale dove anni prima lavorava come medico e questo lo porta a riflettere su come sarebbe potuta essere diversa la sua vita se non fosse diventato una bestia.

Feeling pulled between her current boyfriend and her ex, Cat has to decide between Gabe and Vincent. While Cat and Vincent work together to save Sam’s latest victim, Cat’s decision gets complicated when she and Vincent find themselves in a compromising situation.

Cat and Vincent must revisit a romantic destination as they try to prevent Sam from destroying a group of people.

Vincent has just been arrested for murder and Cat is afraid he'll get a life sentence. Fearing that she may die if she loses him again, she comes up with a plan to help him escape from prison and save him.

A city-wide manhunt for Vincent forces him and Cat to stay under the radar; Vincent and Cat find a surprising ally when the FBI asks them for help with an important case.

Gabe cerca di fare il possibile per far catturare Vincent, convinto di proteggere Cat e nella speranza di tornare un giorno con lei. Nel tentativo di far uscire Vincent allo scoperto, Gabe decide di sospendere sia Cat che Tess come detective.

Vincent è ancora costretto a nascondersi e l'agente Knox offre a lui e Cat una possibilità per non rischiare più di esporsi: entrare in un programma di protezione testimoni, trasferendosi in un'altra città sotto una falsa identità. I due accettano e diventano così i coniugi Vaughn, sperimentando la vita matrimoniale in una nuova casa. Ma un inaspettato omicidio avviene proprio nell'abitazione di fronte, e questo sconvolge tutti i loro piani.

Cat prova a sfruttare il suo ascendente su Gabe per convincerlo a non creare ulteriori problemi a Vincent, il quale, con l'aiuto dell'agente Knox, progetta di consegnarsi alla polizia per essere poi scagionato. Gabe accetta, ma solo ad una condizione: Cat dovrà concedergli un appuntamento, durante il quale lei dovrà essere aperta alla possibilità di rivalutare il loro rapporto. Cat accetta, ma solo per aiutare Vincent. Alla fine della serata però, dopo aver riaccompagnato a casa Cat, Gabe ascolta una conversazione tra lei, Vincent, J.T, Tess ed Heather, e si rende conto che si è trattato di un finto appuntamento. Gabe allora decide di tentare il tutto per tutto per eliminare Vincent.

Cat finds information in a surprising place -- her ancestor's journal -- that makes her think the only way to stop Gabe is to kill Vincent.