4. Taran Killam (Mr. Rad, Season 3-Regional Holiday Music)
We had to see this coming. Joke after joke at the expense of Glee meant it was only a matter of time before a musical episode happened. And Taran Killam was just a perfect choice to fill the role of over-the-top glee club leader. His manipulation of Abed, switching so easily from easy-going Mr. Rad to evil puppet master gave things the dark tone that so much of season 3 displayed. And when we finally realize that hes a murderous madman (Glee club doesnt end. This is forever), its just the perfect ending to a great episode.