Ryan Heinke

Fists, rumors and even "D" batteries fly as the fight between Chris and school bully Joey Caruso escalates, forcing school principal Dr. Raymond to step in.

With Sue now in high school, Axl (who is totally embarrassed by her presence) decides to play a mischievous trick on her, which earns his perfectionist sister a collection of tardy slips. Meanwhile, Mike sets a meeting with Brick’s new fourth grade teacher, Mr. Wilkerson (guest star CHORD OVERSTREET), after learning that he’s allowing his son to skip gym class; and Frankie and Mike bicker over which one of them is really the boss of the family.

The New Directions pay homage to the movie "Saturday Night Fever" by grooving to disco-infused dance numbers. Musical performances include "You Should Be Dancing", "Night Fever", "Disco Inferno", "If I Can't Have You", "How Deep Is Your Love", "Boogie Shoes", "More Than A Woman" and "Stayin' Alive".

Rachel begins school at NYADA, where she meets junior Brody Weston (Dean Geyer) and starts classes with a tough dance instructor, Cassandra July (Kate Hudson). At McKinley High, the rebuilding of New Directions begins and Wade "Unique" Adams (Alex Newell) transfers to join the group. Kurt aids director Will Schuester in finding potential recruits, who include Marley Rose (Melissa Benoist) and Puck's half brother Jake (Jacob Artist).

Jake is pressured to make a decision about his future on the ninth season finale. Comedian Patton Oswalt returns as Walden's ex-business partner, Billy.