The team tries to track down a serial killer, while Abby heads south of the border to give a speech with McGee in tow.
Officer Gabarsky brings a dog that he struck with his car to the ER in hopes of saving its life. Chen and Dr. Carter treat cheerleaders who have eaten LSD-laced Valentine's candy.
While investigating a rural religious cult, the agents expose a sinister experiment involving violent teens and alien DNA.
Mac's boyfriend uses evidence from her files against Harm in a sexual harassment case aboard an aircraft carrier.
Luke is overwhelmed by the funeral arrangements he must make for his deceased Uncle Louie, who was Stars Hollow's most disliked citizen, so Lorelai and Rory work at Luke's diner--without much help from Jess. Meanwhile, Emily's extravagant suggestions for Sookie's upcoming wedding to Jackson (recurring guest star Jackson Douglas) make everyone crazy.
