In "Elementary School Musical," the season premiere episode, Marge sends Lisa to a performing arts camp where artsy counselors (guest voices Jemaine Clement and Bret McKenzie of Flight of the Conchords) and fellow musically inclined campers (guest voices Lea Michele, Cory Monteith and Amber Riley of Glee) inspire her to embrace her creative side. After she returns to Springfield, Lisa becomes restless with her ho-hum suburban lifestyle and catches the first bus to Sprooklyn in hopes of reconnecting with her inner hipster.
This fall, British actors Hugh Laurie (House) and Daniel Radcliffe (Harry Potter and the Half-Blood Prince) provide guest voices in the 21st annual "Treehouse of Horror XXI."
