Since Finn's revelation that he kissed Emma, a seething Will passive-aggressively berates him, while Finn's frustration has him at the boiling point. The New Directions students force them into a lesson on famed musical feuds, demanding they perform a number about rivalry together so they can heal and reteam to lead the glee club to Nationals.
A relieved Rachel determines she's not pregnant, but Santana urges her to use the scare to take a deeper look at where her life's going, especially her relationship. Meanwhile, Brody's secretly working as a paid escort, trysting with clients to Marina And The Diamonds' "How to Be a Heartbreaker" as Rachel ponders how to deal with her feelings for him.
Sue tries to enforce a contract that would bring Blaine back to the Cheerios, but Blaine resists - although Sue's not-so-veiled threats give him pause. Meanwhile, Ryder's entered an online relationship with a mystery girl named Katie_xoxo and is sharing personal secrets, including how Unique angrily confronted him about causing a rift between Marley and Jake that's threatening the harmony within New Directions. Ryder's insistence that Unique is actually a guy doesn't help. Katie suggests Ryder settle their differences with a musical feud number.
When Finn resists the feud lesson, Will tells Finn he only put him in charge of the glee club because he pitied him when his life was falling apart - but Finn betrayed his trust. Now he insists Finn play along so he can kick his butt. Santana trashes Brody despite Rachel's defense, believing that Rachel is underselling herself by being with him. Sue wages a reign of terror against Blaine, prompting a challenge or a feud-off: she'll tear up his contract if he beats her in their Mariah Carey vs. Nicki Minaj showdown, but vows that he won't win.
Marley convinces Jake she doesn't have any plans to leave him for Ryder, but she's not going to give him the cold shoulder either. Ryder and Unique stage a showdown to Elton John's "The Bitch Is Back" and Madonna's "Dress You Up," but tension persists: Unique demands that Ryder admit she's a girl before she'll shake his hand. When Ryder fails to concede, the feud endures - and Jake reminds Ryder that, in the choir room, the students are whatever they choose to be. Meanwhile, Sue perfects the art of the Nicki Minaj "out-of-nowhere" threat by terrorizing Tina.
Confronting Brody at NYADA, Santana warns him to move out of the apartment and stay away from Rachel, in a rendition of Paula Abdul's "Cold Hearted." Meanwhile, Will and Finn face off, '90s boy band-style, to *NSYNC's "Bye Bye Bye" and Backstreet Boys' "I Want It That Way." It helps work out their anger, but in the end Will's still just not ready to hug it out. Finn is hurt but understands and thanks Will for everything he's done for him. Rachel and Kurt confront Santana, embarrassed by her antics at NYADA and concerned about her threats to Brody. They insist she needs to dial it back or move out. Santana explains that she loves them and reads people better than they do, but when they persist, she caves in and leaves.
Katie_xoxo convinces Ryder that if he can believe the two of them are friends despite having never met in person, Unique is also allowed to perceive himself any way he chooses. Blaine kicks off his Mariah Carey-style rendition of Brenda K. Starr's "I Still Believe," while Sue leads a neon-glowing, Minaj-ified Cheerio squad to "Super Bass" - and, shockingly, Sue is the clear victor.
Seeing Finn packing up his desk, Marley boldly advises him to "grow a pair." She relates to what he's going through but also knows he's a natural leader and teacher who doesn't need Will's approval to prove it. Finn agrees but says what he does need is a teaching degree, and Marley suggests that he go out and get one.
Brody proposes a truce to Marley, Jake and Unique, hoping to regain their trust. Unique reveals that after their sing-off, he walked home in his full "Leslie Uggams" glory but was chased by a group of popular girls who taunted him. The group promise to watch Unique's back - as does surprise eavesdropper Kitty, who rallies to Unique's defense because she wants to take the National championship. The group vows to uphold the glee club tradition of being all that you believe you can be after the senior students graduate.
Sue names Blaine co-captain of the Cheerios with Becky, explaining that she's teaching Blaine a lesson about real-world commitments by making him give his word that he's dedicated to the Cheerios. Blaine is secretly thrilled; all along, he and Sam have been working to plant him on the inside to take down Sue's reign of terror before graduation.
On an escort call, Brody's shocked to discover that his latest client is actually Santana, who leaves him in the hotel room to be confronted by Finn. Finn demands that Brody disappear from Rachel's life immediately, but Brody claims that he loves her. Finn counters that Rachel doesn't even know who Brody is - yet. The confrontation gets physical, and they trash the hotel room as they fight, with Finn landing the decisive blow and warning Brody to "stay away from my future wife."
Back at McKinley, New Directions comes back together as a team to Tegan and Sara's "Closer." As Ryder explains the renewed teamwork to Katie_xoxo, he admits he feels like he's moved on from Marley. He tentatively asks if they can meet, but is disappointed when Katie_xoxo suddenly drops offline.