New foreign exchange student, Rory Flanagan, enrolls at McKinley and crashes with Brittany S. Pierce who thinks he's a leprechaun. Meanwhile, Mercedes attempts to recruit new members to join Shelby Corcoran's newly formed Glee club and Sue's congressional campaign heats up.

Sue starts a smear campaign to take down her biggest competitor for the Congressional seat. Meanwhile, Puck has a crush, and Will and Shelby Corcoran encourage some friendly competition.