When the lights go out at McKinley High, there's speculation (from Sam) that it's a zombie apocalypse or (from Unique) that it's Beyonce's Superbowl half-time show. (Shout-out to the Ravens!)

Anyhow, the power outage leads to the decision that New Directions' theme for the week is "unplugged."

Up first is Sam's acoustic rendition of The Righteous Brothers' "You've Lost that Lovin' Feelin'." Then he goes on a rampage about how everyone is too technology-obsessed.

Later we get Ryder on REM's "Everybody Hurts." He then talks about being molested by a babysitter when he was younger, and how it's affected his ability to trust girls. Kitty looks awfully remorseful, hinting that she is probably the person "catfishing" him by posing as someone else in an online relationship with him. But then, over a dinner at Breadsticks, Kitty tells Ryder that she, too, has been molested.

The two seem to be really confiding in one another, but then Ryder shrugs off a lunch date with Kitty to sit around and wait to chat with Katie, clearly hurting her feelings.

On the NYC scene: Yet another intervention at the apartment. This time it's Kurt and Rachel telling Santana they fear she's throwing her life away as a cage dancer go-go girl.

And Sarah Jessica Parker is back! We haven't seen her since the ever-so-bizarre "Let's Have a Kiki" silliness last fall. She enrolls Kurt and his buddies to assist at the New York City Ballet Gala. The four of them recall their personal memories of ballet classes as children to the tune of "At the Ballet" from "A Chorus Line."

It all adds up to a little bit of inspiration for Santana, who enrolls in dance classes through NYADA Extension.

Post-Cheerios, Sue is now a personal trainer and aerobic instructor of "Sue90X." Blaine implores her to return to the school and fess up to whatever really went down the day of the school shooting/lockdown.

"Ninety-five years I gave those girls," Coach Sue complains to Becky as the two watch Cheerios practice from the bleachers. Sue then breaks into song. It's "Little Girls" from "Annie." She doesn't sing often, but when she does it's always impressive and with plenty of panache.

The power, somehow, still out … We get a STOMPesque rendition of "We Will Rock You" from the whole Glee club, with all sorts of creative percussion, including some tapping by Jake.

Principal Figgins gets MVP for best one-liners this episode (usually this honor goes to Coach Sue or Brittney) for congratulating the student body for not spiraling into chaos and cannibalism during the power outage, then welcoming in a "new era of peace and prosperity."

We wrap with a New Directions a cappella rendition of Billy Joel's "For the Longest Time."