Bieber Fever spread through McKinley High in this week's 'Comeback' episode of 'Glee' -- and PopCrush has your recap.

Season 2, Episode 13 was all about making a comeback and finding your inner-anthem -- and now that the glee club going to Regionals with Sue's Cheerios money, they're ready to go all out and kick some vocal butt. But with her cheer squad pulled out from under her, Sue threatens to take her own life and goes on a rage of abuse against the 'Glee' kids. In an attempt to tame her inner-beast, Emma suggests that the depressed cheer coach join the glee club -- and she accepts -- but only to crumble their group from the inside.

Sam knows that he's got to make a big attempt to catch Quinn's eye again, and in his own words, "Who's more rock and roll than Justin Bieber? No one -- that's who." The blond quarterback combs his hair over and kicks off a tribute band -- The Justin Bieber Experience. He samples a bat mitzvah with Bieber's big hit, 'Baby,' and when it proves to make the girls scream, he lays it down for Quinn in the choir room -- complete with a purple hoodie and the Biebs' signature dance moves. He even lets the 'Glee' girls touch his full head of blond Bieber hair. (But we know the real Justin Bieber would never do that!)

Artie, Puck, and Mike Chang are (rightfully) awestruck by the way the girls swoon over Sam, so they insist that he turn his one-man band into a foursome -- because, as Artie argues, "think about the power of four Biebers!" Next thing we know, Puck is in a swoop wig and the boys are dancing their way through Bieber's 'Somebody to Love' in matching hoodies.

Sue attempts to pit Rachel and Mercedes against each other by spreading rumors. But in the spirit of the anthem, they lay down a larger-than-life diva duet of 'Take Me or Leave Me' from RENT, which has them closer than ever. Will then takes Sue to a pediatric cancer ward at the local hospital, and they all sing 'This Little Light of Mine,' which really lifts her spirits and brings them together, too.

Rachel tackles a social revival and wants Brittany to help by dressing like her in "sexy school girl librarian chic," but things go awry and Brittany garners the fashion leader position. Lauren Zizes wants to do a number for glee club, but she's nervous about performing in front of a crowd, so she asks for Puck's advice -- which is to picture the audience in their underwear. With the help of her backup dancers, Tina and Brittany, (and Puck's advice), she rocks the Waitresses' 'I Know What Boys Like.' Meanwhile, Santana gives Sam the strength to admit what he's been avoiding -- Quinn is a cheater -- and he leaves her.

Sue puts her foot down and says no more Bieber! She wants an anthem, and New Directions are going to give her one. The glee club rocks an ensemble performance of the latest My Chemical Romance single, ‘Sing' in the school auditorium, but surprise -- Sue is the new coach for New Directions regionals competition, Oral Intensity.

The 'Comeback' episode of 'Glee' could have easily been called 'Bieber Fever,' but we're just glad that they paid tribute to the teen superstar -- it was about time! Tonight's episode also confirmed that 'Glee' will feature original songs in an upcoming show. Check back each week for our 'Glee' Season 2 recaps.

More From PopCrush