Mr. Schuester thinks he has gotten the upper hand over Sue; Quinn gets in touch with her “funky” side.

Will’s high school rival, special guest star Neil Patrick Harris, returns to McKinley to bring down the glee club. Elsewhere, Artie’s dreams are exposed.

A sore throat impacts Rachel’s singing; Kurt tries to impress his father; Puck hopes to elevate his social status.

Will goes on a witch hunt after a list surfaces with nasty things about the Glee club. In other news, a video pops up from Sue’s past starring Olivia Newton John.

Kurt sets his dad up with an unexpected partner; April (Kristin Chenoweth) returns to save the glee club.

Mr. Schuester is concerned that the guys are disrespecting the women of the glee club; the club members perform some of Madonna’s greatest hits.

Sectionals is finally here for the Glee Club, but when Quinn’s secret unravels, the club may not be able to recover in time to compete. Meanwhile, Sue’s scheming hits an all-time high, and with Emma and Ken’s marriage looming, Will makes a decision that could change his life forever.