Cat and Vincent go out on a date. 

Cat has a pregnancy scare.

Gabe wants to meet Vincent and his eyes give away why.

Gabe tells Cat about his pills, first received from his mother and his desire to swap DNA with Vincent.

Someone suits at Gabe and he escapes, creatured out.

Vincent tells J.T. about Gabe, and hilarity ensues.

Gabe goes after J.T. and they finally take him down with a tranquilizer gun.

Vincent gives his blood for some of Gabe's meds.

Gabe's meds would be lethal to Vincent if he continued to take them.

Cat just wants Vincent in her life, she doesn't care if he's beasty or not.

Gabe's cure from Vincent will also be lethal for Vincent, and Gabe supposedly doesn't care.