Catherine learns that Evan received a research grant to study mutant DNA cells discovered at local crime scenes; despite Joe's martial status, he and Tess get romantically involved.
J.T. thinks Catherine triggers Vincent's blackouts; Tess and Cat investigate when someone tries to murder a teenage pop star.
Vincent is faced with repercussions of his past; Cat confronts her feelings for Vincent while she is in the hospital; J.T. receives an unexpected visit.