When Catherine's (Kristin Kreuk) dad (guest-star Rob Stewart) gets remarried, the bride-to-be and her bridesmaids try to find the daughter-of-the-groom a date for the wedding. Uncomfortable with being set up, Cat reluctantly admits that she's seeing somebody and confides to Vincent (Jay Ryan) that she wishes he could be her date. At the wedding reception, Cat learns about a research grant that Evan (Max Brown) received to study the mutant DNA cells found at local crime scenes. When she tells Vincent about Evan's theory of how the cells are changing to become more animal-like and less human, she encounters an unexpected detour that could change the course of their relationship. Meanwhile, Tess (Nina Lisandrello) and Joe (Brian White) cross the line romantically despite the fact that Joe is a married man.