S2, E11: 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'.