 " I Am Unicorn " is the second episode of the third season of the American musical television series Glee , and the forty @-@ sixth overall . The episode was written by series co @-@ creator Ryan Murphy , directed by series co @-@ creator Brad Falchuk , and first aired on September 27 , 2011 on Fox in the United States . It features the return of Shelby Corcoran ( Idina Menzel ) to the show to direct a rival glee club at William McKinley High even while New Directions , the current club , is having trouble recruiting members . Shelby also wants Quinn ( Dianna Agron ) and Puck ( Mark <unk> ) , the biological parents of her adopted daughter Beth , to be a part of Beth 's life . The director of New Directions , Will Schuester ( Matthew Morrison ) sets up a " booty camp " for the less capable dancers in the club , and auditions for the school musical , West Side Story , begin . 
