Another enemy is set to take Vincent (Jay Ryan) down in the upcoming episode 6, titled "Best of Times, Worst of Times," of the fourth season of the thriller drama "Beauty and the Beast."

After previously dealing with an enemy, Vincent and Cat (Kristin Kreuk) learn that another formidable nemesis is eyeing to take down Vincent. After the discovery, the couple and the rest of their squad have been brought closer together. The newlyweds are left with no other choice but to stand on different sides of the law. Their stance brings trouble to their relationship.

The promo trailer for "Best of Times, Worst of Times" shows Vincent and Cat being briefed that a former sergeant from Afghanistan has killed a beast before. Vincent is worried that he may turn back into a beast again while doing the mission. Cat assures him that she won't let that happen. However, as they carry out their mission, it looks like it is too late for Cat to tame the beast inside Vincent.

In other news, actor Austin Basis shared to Forbes about his character J.T. who has been Vincent's best friend since childhood days.

On why JT remains to be friends with Vincent, despite getting affected by the beast's trouble, Basis said, "J.T. has evolved from a guilt-ridden, cynical person with no life; who [then] put his life on hold to care for his friend and support them both; into a person that has managed to find a life of his own with the woman he loves, while still being able to be loyal to his friend."

He also added that JT has become more patient, sensitive, and romantic over the years. His confidence was also boosted from being the plain yet funny hacker-biochemistry professor to having superpowers.

The all-new episode of "Beauty and the Beast" season 4 airs on Thursday, July 7, at 9 p.m. on The CW.