The BAU team face one of their toughest cases yet ,when a prolific, border-crossing serial killer leads them on a hunt into Canada.
Phoebe helps the ghost of a student who was killed to prevent the publication of her thesis on evil; the Goo Goo Dolls perform at Piper's nightclub.
After a heavy rain, the CSI team is called to investigate the deaths of two people found in sewage drains to determine whether either was murder.
Sue comes up with a new cheerleading stunt, and Schuester and Beiste force the football team and the male Glee Club members to work together.
Earl decides to quit smoking and soon discovers it's harder than he anticipated; Joey comes to a conclusion on the best way to inherit Earl's money.