'Glee' Recap: Seniors' Futures Revealed and More Top Moments

Trouble Tones Reunited
Mercedes (Amber Riley), Santana (Naya Rivera) and Brittany (Heather Morris) are reunited as the Trouble Tones in the "Saturday Night Fever" episode.

[Warning: This story contains spoilers from Tuesday's "Saturday Night Glee-ver" episode of Glee.]

??Glee welcomed the return of a familiar but not-so-friendly face and a Glee Project runner-up Tuesday when the Fox dramedy took on songs from the soundtrack of the '70s, Saturday Night Fever. ?

Darren Criss' Blaine opened the episode with a cover of the Bee Gees' "You Should be Dancing" -- with support from Mike (Harry Shum Jr.) and Brittany (Heather Morris) -- explaining the theme for Nationals: Vintage, with a flashback to Will's (Matthew Morrison) time with glee club. Did anyone else think high school Will looked a lot like Jesse Eisenberg?! Here are the scene-stealers and shockers from Tuesday's "Saturday Night Glee-ver" episode.

PHOTOS: 'Glee' Season 3: The Episodics

1. Will reveals that three of the New Directions seniors are in trouble: Finn, who has talent but no self-esteem; Mercedes, who lacks vision; and Santana, who has ambition but no focus and wants to skip college.

2. Enter Alex Newell, The Glee Project's co-runner up, who is the biggest fan of Mercedes and Kurt. He plays Wade Adams, a member of Vocal Adrenaline, who's there to seek advice about how to handle his coach, Jesse St. James (Jonathan Groff). Scene-stealer: Newell, who's alter ego Unique, speaks in the third person and refers to herself as the love child of Kurt and Mercedes -- both embracing Newell's love of drag and staying true to Ryan Murphy and Brad Falchuk's vision of who he'd play on the flagship series.

3. Sue and Will bribe New Directions -- with a replica of John Travolta's costume from Saturday Night Fever -- to participate in the disco-themed project. While the auto-tune on "Night Fever" was a bit over the top it was a fun way to get the entire cast to stage a group number and proved that the show doesn't always need a big stage. Scene-stealer: the whole cast.

AUDIO: 'Glee' First Listen: Vocal Adrenaline Returns and the Cast Performs 'Saturday Night Fever'

4. Mercedes reveals her dream for the future: to be like Mariah Carey, Whitney Houston ("rest in peace," she says, a nice touch) and Aretha Franklin. But she doesn't know how to achieve them and is scared to even think about moving to L.A., especially without her father's support. Scene-stealer: Sam, who recorded her cover of the Tramps' "Disco Inferno," and still believes in Mercedes despite their failed romantic reunion.

5. Finn tells Puck that he can't go with him to L.A., because it's not his dream. After reassuring Puck that he can make it in L.A. without him, Puck makes his best friend vow to not only follow his dreams but to dream big.

6. Santana sings Yvonne Elliman's "If I Can't Have You" in a swoonworthy love song to Brittany that Will interprets as a career quest for LGBT marriage equality, and law school. But Santana clarifies: Her second love is fame and is 1,000 percent sure she'll be famous, if it's the last thing she does. Scene-stealer: the writers for the brilliant gem Santana hurls at the often seen but never heard "man child piano player."

7. Rachel and Finn, back on speaking terms, Rachel says they don't have to go to New York and finally takes the time to help Finn explore what his may be. She says her home isn't "some place, it's someone": Finn. She wants them to go to New York but not until they give Finn a shot at his dreams. She apologizes in song, naturally. Scene-stealer: Finn, who after meeting with Will and Emma, dumps all the college brochures and lets everyone, including Rachel, think he's weighing his collegiate options. 

PHOTOS: 'Glee's' Unforgettable Guest Stars

8. Santana gets her fame: Two Girls, One Cat, a sex tape that Brittany spliced together with footage of her cat Lord Tubbington performing household chores. Later, she suggests Santana do something outlandish and score herself a gig on a reality show, like Fear Factor. Scene-stealer: Where do we get a copy of Lord Tubbington's hilarity?!

9. Finn's busted. Will knew Finn was just humoring them and confronts the New Directions captain about his future. An angry and emotional Finn says he's not qualified to do anything and wants time to stop, he wants to keep that feeling of being young, and in keeping with the week's assignment, Will forces him to watch Saturday Night Fever.

10. Sue suggests Kurt and Mercedes convince Wade to embrace Unique and go out on stage in drag in an effort to get their rivals to tank. When they go to stop him -- it is small-town Ohio, after all -- it's too late and Wade has already decided to embrace how he feels inside, that he identifies as a woman, and Unique covers KC & the Sunshine Band's "Boogie Shoes," as Vocal Adrenaline coach Jesse St freaks out. But Sue's plan backfires and the crowed eats up Unique's performance. Scene-stealer: Newell for embracing the person he is.

STORY: 'Glee': Graduation Album Offers a Preview of Season Finale Song List

11. All the couples on the floor: Finn covers the Bee Gees' "More Than a Woman" while dancing with Rachel as Kurt and Blaine, Santana and Brittany as well as Mike and Tina share a sweet dance. He uses the song to reveal what he's going to do next year: He wants to move to New York and live with Rachel and study at the Actors Studio. His dream is to be an actor. Scene-stealer: both. It's nice to see them back on the same page.

12. Sam posts Mercedes' performance on YouTube -- to rave reviews. "I believe in you, and what you can become and now complete strangers believe in you, too," he tells her. "It's time for this dream to stop being a dream and become a reality." Scene-stealer: Both of them, as it's a Samcedes reunion!

13. Santana's (possible) future is revealed: Sue informs her fame-seeking Cheerio that she's been accepted on a full scholarship to the University of Louisville, the nation's top cheerleading program. Aware that she doesn't want to be a cheerleader all her life, Sue tells her it'll get her foot in the door. The best part: the whole thing was Brittany's idea as the couple professes their love for one another. Scene-stealer: Brittany. Best. Girlfriend. Ever.

14. The episode ends with a full New Directions staged performance of the Bee Gees' "Stayin' Alive," in full Travolta attire, with Sue and Will joining the group as their disco-themed mission is accomplished: Finn, Mercedes and Santana all have a better plan for their respective futures. Scene-stealer: Jane Lynch finally getting to be a part of a full cast performance, singing and dancing. More shimmy, please!

What did you think of the disco infusion? Do you think Santana will go to college? Are you happy Sam and Mercedes are back together? Does Finn have what it takes to be an actor? Hit the comments with your thoughts. Glee airs Tuesdays at 8 p.m. on Fox.

Email: Lesley.Goldberg@thr.com; Twitter: @Snoodit