He lies to Catherine, claiming he had a memory flash, but Catherine realizes Vincent's on to her. He manages to stop Tyler from blowing up an office building, but before he can kill Tyler, Catherine stops him. Catherine finds out Sam is seeking revenge against the people who killed his son. Following the therapist's advice, the two go their separate ways for a day, with Catherine working on a case and Vincent going upstate to provide medical care to those out of reach for a hospital. When Catherine kept Vincent's existence a secret, lying to Tess was the hardest for her and upset Catherine the most because Tess trusted her. Vincent shows up to protect Catherine, but Zach shows up and goes after her; Vincent kills Zach, saving Catherine's life. The group splits up to find J.T. They agree, and are brought back to Julianna Keaton, the scientist creating superhumans. When Evan catches Cat and Vincent together, he confronts her and, jealous and hurt, helps Muirfield capture Vincent. He immediately regrets it and leaves. is kidnapped by another superhuman experiment, Alton Finn. Catherine was the first person who accepted Vincent after what he had become. Vincent & Catherine then meet up with FBI Agent Knox, who promises to get Vincent exonerated if they can help rescue his agent. She often helps Catherine stay focused when she's distracted by anything related to Vincent. Initially hopeful that he won't have to be a beast anymore, Catherine finds out that Gabe's medication will kill Vincent, and tells him to stop taking it for her sake. They were willing to do anything to create beasts as weapons, including letting Sam's son die. For a while, though, they're able to feel like a normal couple. The two start to make amends during this time, and after solving the case, the two go for couples' counseling. Catherine later asks Vincent to join her for dinner, because that's what she would want for her birthday. Vincent & Catherine later sit at a park and enjoy the moment – no longer having to run from the past or worry about their future, finally together like they always wished they could be.[21]. Vincent tells Cat that whoever injected Bob & Carol was after him, but Catherine says they'll figure it out, as they've shown they can handle a threat separately and together. In the first season, his appearance is made to look like a vagrant, scruffy and a little unkempt. Catherine figures out Sam is the one trying to create a beast to help him get revenge on the people who killed his son. As they try to leave, Muirfield closes in on them, and Evan sacrifices himself, getting shot and killed, allowing Cat and Vincent to escape. When they tried to kill Catherine, she ran into the woods but tripped and fell. After he is abducted by Muirfield and his DNA is super-charged, his transformation changes. Vincent wants to try and reason with Zach, but Reynolds calls him and reveals that Zach killed Gabriella, and is dangerous. Vincent later finds out that Catherine, Tess, and the precinct were taken hostage by the other thieves. Soon after, Catherine is kidnapped from her house by an unknown group. is Vincent's best friend. Vincent is furious and threatens to turn primal, but Bob says he wants to see that happen. Meanwhile, Catherine goes home, where she & Heather make amends before Heather leaves to Miami. Catherine decides to keep Vincent's secret, but also lets him know that she will not let him push her away or disappear again. Vincent tries to elude Bob and his many traps, and also figure out who Bob is working for. However, his older brother, William, told him to become a doctor instead to keep him from getting killed. On her first night, she had car trouble after closing up and called her mother for help. Furious, Catherine beats Gabe unconscious; Catherine freaks out about having possibly killed him. The two became close over time. Just as Catherine hands over Liam's case to DHS, Vincent saves Alton from being killed by the hitman. Catherine is caught by Tess destroying evidence that could expose Vincent. He broke off their engagement before being deployed, but Alex was still in love with him, even after he was presumed dead. Catherine finds out that there is a gene that makes people change into beasts when injected with a serum, and that the group of kids from the orphanage Gabe grew up in carry this gene. Gabe tries to use the defibrillator to revive Eddie, but the plan fails. Vincent pulls a badly injured Catherine out of the car, but leaves her in the middle of the road when Evan and Heather show up. Catherine holds him at gunpoint, begging him to walk away and choose his humanity. When they check on J.T., Tess says the doctors think he won't make it, but they come to his room, and find out he'll recover. Catherine is skeptical to believe him until he reveals that Dana was the one who told him to get Catherine & Vincent's help. Afterwards, Catherine helps Alex disappear and leave town. Vincent saves Catherine and kills Sebastian. As they're escaping, Evan asks Vincent if he knows about Catherine's parents, to which Vincent replies he does, but says they can't tell her. Vincent tries to find the new beast Sam has created. Vincent still tries to track down Liam on his own, and finds out Liam has sent hitmen to take out Julianna's experiments. J.T. They bring her to the church and detain Julianna, but Catherine leaves, upset that Vincent lied to her. Catherine convinces Curt to, making him choose between being a beast or getting Tori back. Vincent moves in with Catherine, but realizes his primal side is acting up over having to give up his own place. Vincent & Catherine find Julianna's body, brutally ripped apart. because he was "the only person Vincent could trust. With encouragement from Tori, he comes forward and reveals himself to the press. Catherine grew up in Westchester with her parents, Thomas & Vanessa Chandler, and her younger sister, Heather. Vincent admits to J.T. He reveals himself to also be a beast, and explains that he's trying to find Vincent because he uses medication to control his transformations, but is hoping that Vincent could help him control them without it. When Vincent was heading over, he blacked out and woke up on top of Brooklyn Bridge. Despondent over not fulfilling his revenge, Sam contemplates suicide. After he becomes unhinged and tries, but fails, to destroy Vincent, Catherine realized Gabe was no longer the man she once loved.[30]. runs tests to find out the cause, and Vincent is shown to be violent when he blacks out. Catherine & Vincent both realize that the attacker, Tyler Zane, was actually enhanced by a serum the way Vincent was. However, after the death of Vincent's brothers in the twin tower attacks in 2001, Vincent gave up his medical career to join the army and ended his engagement to Alex. The parasite soon causes an outbreak that Vincent has to handle at the hospital. He tries not to give into his instinctive reactions to prove to himself and the ones he cares about most that he isn't dominated by who he is as a beast. Vincent shows up to rescue her, but is unable to transform due to the effect of the medication. He was told that he was being injected with antibiotics, vitamins, and steroids that would protect him, when in fact, he was being injected with a serum designed to trigger rapid genetic mutation. Catherine finds out later that her attending nurse, Alex Salter, knows Vincent and caught him visiting her. Vincent eventually tracks Catherine down, and finds out Catherine was taken by FBI agents who want her & Vincent's help to find an agent abducted by a terrorist cell. Together, the two of them manage to stop the thieves and realize the gem can stop beasts from using their powers. Gabe comes up with a plan to arrest Reynolds. When he starts to accept it again and use it for good, he regains Catherine's trust, and they reconcile. After Tori's death, Vincent felt responsible for Tori dying, and realized his mistake in choosing to be more beast than human. However, they find out he was actually a plant trying to find them. However, he finds out she's been talking to Thomas & Barnett behind his back about a new threat. I had the chance to make a difference. was forced to make. The two head back to the church for the ceremony.