Scott Lincoln

The BAU team face of their toughest cases yet when a prolific, border-crossing serial killer leads them on a hunt into Canada.

Earl tackles two items on his karma list: making up for all the second-hand smoke he's inflicted on the world, and confessing to a man who served time for a crime he committed. Meanwhile, Joy decides to kill Earl so she can inherit his money.

When the football team continues to harass the male glee club members, Schuester and Beiste decide to force the groups to work together. Meanwhile, Sue comes up with a new cheerleading stunt involving a circus cannon and Brittany and the other girls have to choose whether to put their lives at risk, or join the glee club in a half-time mashup of `Thriller' and `Heads Will Roll'.